mips.c (mips_global_pointer): Check call_really_used_regs instead of call_used_regs.

gcc/
	* config/mips/mips.c (mips_global_pointer): Check
	call_really_used_regs instead of call_used_regs.
	(mips_save_reg_p): Likewise.  Save all call-saved registers
	if current_function_saves_all_registers.  Fix indentation.
	No longer treat $18 as a special case.
	(compute_frame_size): Guard FPR loop with TARGET_HARD_FLOAT.

gcc/testsuite/
	* gcc.target/mips/call-saved-1.c: New test.
	* gcc.target/mips/call-saved-2.c: Likewise.
	* gcc.target/mips/call-saved-3.c: Likewise.
	* gcc.target/mips/mips.exp (setup_mips_tests): Set mips_gp64
	instead of mips_mips64.  Set mips_fp64 too.
	(is_gp32_flag): Return true for -mips1 and -mips2.
	(dg-mips-options): Use mips_gp64 instead of mips_mips64.

From-SVN: r128347