Centralise clearing hardware capabilities with Sun ld

Centralise clearing hardware capabilities with Sun ld

	gcc:
	* configure.ac ($gcc_cv_ld_clearcap): New test.
	* configure: Regenerate.
	* config.in: Regenerate.
	* config/sol2.opt (mclear-hwcap): New option.
	* config/sol2.h (LINK_CLEARCAP_SPEC): Define.
	* config/sol2-clearcap.map: Moved here from
	testsuite/gcc.target/i386/clearcap.map.
	* config/sol2-clearcapv2.map: Move here from
	gcc.target/i386/clearcapv2.map.
	* config/t-sol2 (install): Depend on install-clearcap-map.
	(install-clearcap-map): New target.
	* doc/invoke.texi (Option Summary, Solaris 2 Options): Document
	-mclear-hwcap.

	gcc/testsuite:
	* lib/clearcap.exp: New file.
	* gcc.dg/vect/vect.exp: Load clearcap.exp.
	Remove clearcap_ldflags handling.
	Call clearcap-init, clearcap-finish.
	* gcc.target/i386/i386.exp: Likewise.
	* gcc.target/i386/clearcap.map: Move to ../config/sol2-clearcap.map.
	* gcc.target/i386/clearcapv2.map: Move to
	../config/sol2-clearcapv2.map.
	* gcc.target/x86_64/abi/avx/abi-avx.exp: Likewise.
	* gcc.target/x86_64/abi/avx512f/abi-avx512f.exp: Likewise.

	libitm:
	* acinclude.m4 (LIBITM_CHECK_LINKER_HWCAP): Check for
	-mclear-hwcap instead.
	* configure: Regenerate.
	* clearcap.map: Remove.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@211014 138bc75d-0d04-0410-961f-82ee72b054a4