Enable libsanitizer on Solaris (PR sanitizer/80953)

Enable libsanitizer on Solaris (PR sanitizer/80953)

	gcc:
	PR sanitizer/80953
	* config/sol2.h (ASAN_CC1_SPEC): Define.
	(LD_WHOLE_ARCHIVE_OPTION): Define.
	(LD_NO_WHOLE_ARCHIVE_OPTION): Define.
	(ASAN_REJECT_SPEC): Provide default.
	(LIBASAN_EARLY_SPEC): Define.
	(LIBTSAN_EARLY_SPEC): Define.
	(LIBLSAN_EARLY_SPEC): Define.
	* config/i386/sol2.h (CC1_SPEC): Redefine.
	(ASAN_REJECT_SPEC): Define.

	* config/sparc/sparc.c (sparc_asan_shadow_offset): Declare.
	(TARGET_ASAN_SHADOW_OFFSET): Define.
	(sparc_asan_shadow_offset): New function.
	* config/sparc/sol2.h (CC1_SPEC): Append ASAN_CC1_SPEC.
	(ASAN_REJECT_SPEC): Define.

	gcc/testsuite:
	PR sanitizer/80953
	* c-c++-common/asan/alloca_loop_unpoisoning.c: Require alloca
	support.
	(foo): Use __builtin_alloca.

	libsanitizer:
	PR sanitizer/80953
	* configure.tgt (sparc*-*-solaris2.11*): Enable.
	(x86_64-*-solaris2.11* | i?86-*-solaris2.11*): Enable.

From-SVN: r265837