X86: Remove pcommit instruction

X86: Remove pcommit instruction

Remove x86 pcommit instruction support, which has been deprecated:

https://software.intel.com/en-us/blogs/2016/09/12/deprecate-pcommit-instruction

gas/

	* config/tc-i386.c (cpu_arch): Remove .pcommit.
	* doc/c-i386.texi: Likewise.
	* testsuite/gas/i386/i386.exp: Remove pcommit tests.
	* testsuite/gas/i386/pcommit-intel.d: Removed.
	* testsuite/gas/i386/pcommit.d: Likewise.
	* testsuite/gas/i386/pcommit.s: Likewise.
	* testsuite/gas/i386/x86-64-pcommit-intel.d: Likewise.
	* testsuite/gas/i386/x86-64-pcommit.d: Likewise.
	* testsuite/gas/i386/x86-64-pcommit.s: Likewise.

opcodes/

	* i386-dis.c (PREFIX_RM_0_0FAE_REG_7): Removed.
	(prefix_table): Remove the PREFIX_RM_0_0FAE_REG_7 entry.
	(rm_table): Update the RM_0FAE_REG_7 entry.
	* i386-gen.c (cpu_flag_init): Remove CPU_PCOMMIT_FLAGS.
	(cpu_flags): Remove CpuPCOMMIT.
	* i386-opc.h (CpuPCOMMIT): Removed.
	(i386_cpu_flags): Remove cpupcommit.
	* i386-opc.tbl: Remove pcommit.
	* i386-init.h: Regenerated.
	* i386-tbl.h: Likewise.