* doc/invoke.texi: Document new MIPS -msym32 and -mno-sym32 options.
	* config/mips/mips.h (MASK_SYM32, TARGET_SYM32): New macros.
	(TARGET_SWITCHES): Add -msym32 and -mno-sym32.
	(ABI_HAS_64BIT_SYMBOLS): Set to false if TARGET_SYM32.
	(ASM_SPEC): Pass down -msym32 and -mno-sym32.

From-SVN: r95926