m68hc11.c (m68hc11_override_options): Don't use soft registers by default for 68HC12.

m68hc11.c (m68hc11_override_options): Don't use soft registers by default for 68HC12.

	* config/m68hc11/m68hc11.c (m68hc11_override_options): Don't use
	soft registers by default for 68HC12.
	(m68hc11_conditional_register_usage): Don't use Z register for 68HC12
	when compiling with -fomit-frame-pointer.
	(expand_prologue): Use push/pop to allocate 4-bytes of locals on 68HC12.
	(expand_epilogue): Likewise.
	(m68hc11_gen_rotate): Use exg when rotating by 8.

From-SVN: r50882