* config/sparc/sparc.h (SPARC_DEFAULT_CMODEL): Default to CM_32.
	(CONDITIONAL_REGISTER_USAGE): For block profiling fix %g4 on sparc64,
	not %g2.
	(MACHINE_STATE_SAVE, MACHINE_STATE_RESTORE): Use %g4 instead of %g2
	as sparc64 block profiling register.
	* config/sparc/sparc.c (sparc_override_options): Allow block
	profiling with -m32.
	(sparc_block_profiler): Use %g4 instead of %g2 as sparc64 block
	profiling register.
	* config/sparc/linux64.h (MACHINE_STATE_*): Only provide these
	macros on TARGET_ARCH32. sparc.h has macros good enough for sparc64.
	* config/sparc/sol2.h (MACHINE_STATE_*): Likewise.

From-SVN: r30916