re PR c++/12945 (MIPS g++.old-deja/g++.abi/ptrflags.C fails.)

re PR c++/12945 (MIPS g++.old-deja/g++.abi/ptrflags.C fails.)

	PR target/12945
	* coverage.c (coverage_counter_alloc): Set SYMBOL_FLAG_LOCAL for
	for counter labels.
	* config/mips/mips.c (INTERNAL_SYMBOL_P): Delete.
	(mips_classify_symbol): Always treat SYMBOL_REF_FLAG as indicating
	string constants if TARGET_MIPS16.  Use SYMBOL_REF_DECL to check
	the binding of decl symbols, otherwise check SYMBOL_REF_LOCAL_P.
	(mips_symbol_insns): Don't trust the local/global classification.
	(m16_usym8_4, m16_usym5_4): Same mips16 change as mips_classify_symbol.
	(override_options): Make -mabicalls -fno-unit-at-a-time imply
	-mno-explicit-relocs.
	(mips_encode_section_info): Don't use SYMBOL_REF_FLAG to distinguish
	between local and global symbols.

From-SVN: r75422