re PR rtl-optimization/12612 (ICE when using log function with -O3 -ffast-math)

re PR rtl-optimization/12612 (ICE when using log function with -O3 -ffast-math)

	* i386.c (print_reg): Do not abort on certain registers.

	PR optimization/12612
	* reg-stack.c (subst_stack_regs_pat):  Use st(1) for clobbers.
	* i386.md (fpatan, fyl2x, fscale patterns and expanders): Use
	match_scratch; avoid bogus paralles.

	PR target/12674
	* i386.c (ix86_function_regparm): Disable implicit register passing
	conventions when profiling.

From-SVN: r72681