hwasan: Add libhwasan_preinit.o

hwasan: Add libhwasan_preinit.o

I've noticed an inconsistency with the other sanitizers.
For -fsanitize={address,thread,leak} we link into binaries
lib*san_preinit.o such that the -lasan, -ltsan or -llsan libraries
are initialized as early as possible through .preinit_array.
The hwasan library has the same thing, but we strangely compiled
it into the library (where it apparently didn't do anything,
.preinit_array doesn't seem to be created for shared libraries),
rather than installing it like in the other 3 cases.

The following patch handles it for hwasan similarly to asan, tsan and lsan.

I don't have any hw with hwasan support, so I've just checked it
builds and installs as expected and that
gcc -fsanitize=hwaddress -o a a.c -mlam=u57
on trivial main results in .preinit_array section in the binary.

2022-12-19  Jakub Jelinek  <jakub@redhat.com>

	* config/gnu-user.h (LIBHWASAN_EARLY_SPEC): Add libhwasan_preinit.o
	to link spec if not -shared.

	* hwasan/Makefile.am (nodist_toolexeclib_HEADERS): Set to
	libhwasan_preinit.o.
	(hwasan_files): Remove hwasan_preinit.cpp.
	(libhwasan_preinit.o): Copy from hwasan_preinit.o.
	* hwasan/Makefile.in: Regenerated.