Add OR operator for option '--with-extra-multilib-test'

This patch allows you provide the flags in build flags array acts on arch-abi
__respectively__, you can use ',' to separate them. For example:

`rv64gcv-lp64d:--param=riscv-autovec-lmul=dynamic,--param=riscv-autovec-preference=fixed-vlmax`

will be consider as two target boards same as below:

```
riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-preference=fixed-vlmax
riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-lmul=dynamic
```

However, you can also leverage AND(`:`), OR(`,`) operator together but the
OR(`,`) will always have the higher priority. For example:

`rv64gcv-lp64d:--param=riscv-autovec-lmul=dynamic:--param=riscv-autovec-preference=fixed-vlmax,--param=riscv-autovec-lmul=m2`

will be consider as tow target boars same as below:

```
riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-lmul=dynamic/--param=riscv-autovec-preference=fixed-vlmax
riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-lmul=m2
```

Signed-off-by: Pan Li <pan2.li@intel.com>

README.md

@@ -261,14 +261,59 @@ even multilib is disable, but the user must ensure extra multilib test
 configuration can be work with existing lib/multilib, e.g. rv32gcv/ilp32 test
 can't work if multilib didn't have any rv32 multilib.
 
-`--with-extra-multilib-test` also allow you append additional build flags after
-the arch/ABI, for example: built a linux toolchain with `rv64gc/lp64d`, and you
-can test more configuration like `rv64gcv/lp64d` with one additional build config
-`--param=riscv-autovec-lmul=dynamic`, then you can use --with-extra-multilib-test
-to specify that via
-`--with-extra-multilib-test="rv64gcv-lp64d:--param=riscv-autovec-lmul=dynamic"`.
-Then the testing will build the run test with option `--param=riscv-autovec-lmul=dynamic`
-before run the `rv64gcv-lp64d` test.
+`--with-extra-multilib-test` also support more complicated format to fit the
+requirements of end-users. First of all, the argument is a list of test
+configurations. Each test configuration are separated by `;`. For example:
+
+  `rv64gcv-lp64d;rv64_zvl256b_zvfh-lp64d`
+
+For each test configuration, it has two parts, aka required arch-abi part and
+optional build flags. We leverage `:` to separate them with some restrictions.
+
+  * arch-abi should be required and there must be only one at the begining of
+    the test configuration.
+  * build flags is a array-like flags after the arch-abi, there will be two
+    ways to arrange them, aka AND, OR operation.
+  * If you would like the flags in build flags array acts on arch-abi
+    __simultaneously__, you can use `:` to separate them. For example:
+
+   ```
+   rv64gcv-lp64d:--param=riscv-autovec-lmul=dynamic:--param=riscv-autovec-preference=fixed-vlmax
+   ```
+
+   will be consider as one target board same as below:
+
+   ```
+   riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-lmul=dynamic/--param=riscv-autovec-preference=fixed-vlmax
+   ```
+
+  * If you would like the flags in build flags array acts on arch-abi
+    __respectively__, you can use ',' to separate them. For example:
+
+   ```
+   rv64gcv-lp64d:--param=riscv-autovec-lmul=dynamic,--param=riscv-autovec-preference=fixed-vlmax
+   ```
+
+   will be consider as two target boards same as below:
+
+   ```
+   riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-preference=fixed-vlmax
+   riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-lmul=dynamic
+   ```
+
+  * However, you can also leverage AND(`:`), OR(`,`) operator together but the
+    OR(`,`) will always have the higher priority. For example:
+
+   ```
+   rv64gcv-lp64d:--param=riscv-autovec-lmul=dynamic:--param=riscv-autovec-preference=fixed-vlmax,--param=riscv-autovec-lmul=m2
+   ```
+
+   will be consider as tow target boars same as below:
+
+   ```
+   riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-lmul=dynamic/--param=riscv-autovec-preference=fixed-vlmax
+   riscv-sim/-march=rv64gcv/-mabi=lp64d/-mcmodel=medlow/--param=riscv-autovec-lmul=m2
+   ```
 
 ### LLVM / clang
 

scripts/generate_target_board

@@ -29,17 +29,16 @@ def parse_options(argv):
 #   riscv-sim/-march=rv64gcv_zvl256b/-mabi=lp64d/-mcmodel=medlow
 # From the config_string like below, --param is optional
 #   rv64gcv_zvl128b-lp64d:--param=riscv-autovec-lmul=m1
-def generate_one_target_board(config_string, options):
-  configs = config_string.split(":")
-  arch_and_abi = configs[0].split("-")
+def generate_one_target_board(arch_abi, flags, options):
+  arch_and_abi = arch_abi.split("-")
   arch = arch_and_abi[0]
   abi = arch_and_abi[1]
 
-  if len (configs) == 1:
+  if len(flags) == 0:
     return "{0}/-march={1}/-mabi={2}/-mcmodel={3}".format(
       options.sim_name, arch, abi, options.cmodel)
 
-  flags = '/'.join(configs[1:])
+  flags = flags.replace(":", "/")
 
   return "{0}/-march={1}/-mabi={2}/-mcmodel={3}/{4}".format(
     options.sim_name, arch, abi, options.cmodel, flags)
@@ -52,14 +51,25 @@ def main(argv):
     return
 
   target_board_list = [
-    generate_one_target_board(options.build_arch_abi, options)
+    generate_one_target_board(options.build_arch_abi, "", options)
   ]
 
   if options.extra_test_arch_abi_flags_list:
     extra_test_list = options.extra_test_arch_abi_flags_list.split (";")
 
     for extra_test in extra_test_list:
-      target_board_list.append(generate_one_target_board(extra_test, options))
+      idx = extra_test.find(":")
+
+      if idx == -1:
+        one_target_board = generate_one_target_board(extra_test, "", options)
+        target_board_list.append(one_target_board)
+      else:
+        arch_abi = extra_test[:idx - 1]
+        flags = extra_test[idx + 1:]
+
+        for flag in flags.split(","):
+          one_target_board = generate_one_target_board(arch_abi, flag, options)
+          target_board_list.append(one_target_board)
 
   print(' '.join(target_board_list))