refactor: Move halt out of dcsr

Suggested in https://github.com/riscv-software-src/riscv-isa-sim/pull/1816#pullrequestreview-2331806142.

riscv/csrs.cc

@@ -1345,7 +1345,6 @@ dcsr_csr_t::dcsr_csr_t(processor_t* const proc, const reg_t addr):
   ebreaku(false),
   ebreakvs(false),
   ebreakvu(false),
-  halt(false),
   v(false),
   cause(0),
   ext_cause(0),

riscv/csrs.h

@@ -696,7 +696,6 @@ class dcsr_csr_t: public csr_t {
   bool ebreaku;
   bool ebreakvs;
   bool ebreakvu;
-  bool halt;
   bool v;
   uint8_t cause;
   uint8_t ext_cause;

riscv/execute.cc

@@ -216,8 +216,8 @@ void processor_t::step(size_t n)
       enter_debug_mode(DCSR_CAUSE_DEBUGINT, 0);
     } else if (halt_request == HR_GROUP) {
       enter_debug_mode(DCSR_CAUSE_GROUP, 0);
-    } else if (state.dcsr->halt) {
-      state.dcsr->halt = false;
+    } else if (halt) {
+      halt = false;
       enter_debug_mode(DCSR_CAUSE_HALT, 0);
     }
   }

riscv/processor.cc

@@ -186,7 +186,7 @@ void processor_t::reset()
 {
   xlen = isa.get_max_xlen();
   state.reset(this, isa.get_max_isa());
-  state.dcsr->halt = halt_on_reset;
+  halt = halt_on_reset;
   halt_on_reset = false;
   if (any_vector_extensions())
     VU.reset();

riscv/processor.h

@@ -384,6 +384,7 @@ private:
   FILE *log_file;
   std::ostream sout_; // needed for socket command interface -s, also used for -d and -l, but not for --log
   bool halt_on_reset;
+  bool halt;
   bool in_wfi;
   bool check_triggers_icount;
   std::vector<bool> impl_table;