ld: Discard .rel.* and .rela.* sections

On many targets, like x86, .rel.dyn/.rela.dyn section is combined from
different .rel/.rela sections by -z combreloc.  To discard dynamic
relocation section, we need to discard .rel.* and .rela.* sections
instead of .rel.dyn and .rela.dyn sections.

Note: This test fails for targets which issue a warning when dynamic
section is discarded.

	* testsuite/ld-elf/reloc-discard.ld: Discard .rel.* and .rela.*
	sections instead of .rel.dyn and .rela.dyn sections.

ld/ChangeLog

@@ -1,3 +1,8 @@
+2018-07-20  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* testsuite/ld-elf/reloc-discard.ld: Discard .rel.* and .rela.*
+	sections instead of .rel.dyn and .rela.dyn sections.
+
 2018-07-20  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/23428

ld/testsuite/ld-elf/reloc-discard.ld

@@ -2,5 +2,5 @@ SECTIONS
 {
   /* .dynamic needs to go first with MIPS IRIX-style emulations.  */
   .dynamic : { *(.dynamic) }
-  /DISCARD/ : { *(.rel.dyn) *(.rela.dyn) }
+  /DISCARD/ : { *(.rel.*) *(.rela.*) }
 }