sync.c: Move to ../libgcc.

	gcc:
	* config/sync.c: Move to ../libgcc.
	* Makefile.in (libgcc.mvars): Remove LIBGCC_SYNC,
	LIBGCC_SYNC_CFLAGS.
	* config/mips/t-libgcc-mips16 (LIBGCC_SYNC, LIBGCC_SYNC_CFLAGS):
	Remove.

	libgcc:
	* sync.c: New file.
	* config/mips/t-mips16: New file.
	* config.host (mips64*-*-linux*): Add mips/t-mips16 to tmake_file.
	(mips*-*-linux*): Likewise.
	(mips*-sde-elf*): Likewise.
	(mipsisa32-*-elf*): Join with mipsisa32r2-*-elf*,
	mipsisa64-*-elf*, mipsisa64r2-*-elf*.
	Add mips/t-mips16 to tmake_file.
	(mipsisa64sb1-*-elf*): Add mips/t-mips16 to tmake_file.
	(mips-*-elf*): Likewise.
	(mips64-*-elf*): Likewise.
	(mips64orion-*-elf*): Likewise.
	(mips*-*-rtems*): Likewise.
	(mipstx39-*-elf*): Likewise.
	* Makefile.in: Use SYNC instead of LIBGCC_SYNC.
	($(libgcc-sync-size-funcs-o)): Use SYNC_CFLAGS instead of
	LIBGCC_SYNC_CFLAGS.
	Use $(srcdir) to refer to sync.c.
	Use $<.
	($(libgcc-sync-funcs-o)): Likewise.
	($(libgcc-sync-size-funcs-s-o)): Likewise.
	($(libgcc-sync-funcs-s-o)): Likewise.

From-SVN: r177601