* config/mips/mips.h (MASK_FIX_VR4122, TARGET_FIX_VR4122): New macros.
	(TARGET_SWITCHES): Add -mfix-vr4122-bugs and -mno-fix-vr4122-bugs.
	(ASM_SPEC): Pass down -mfix-vr4122-bugs.
	* config/mips/mips.c (mips_avoid_hazards): Don't emit whole functions
	in .set noreorder and .set nomacro if TARGET_FIX_VR4122.
	(mips_init_libfuncs): Use special functions for divsi3 and modsi3
	if TARGET_FIX_VR4122.
	* config/mips/mips.md (define_attr length): Account for nops inserted
	after macc and dmult when using -mfix-vr4122-bugs.
	(umuldi3_highpart, divmodsi4, divmoddi4): Disable if TARGET_FIX_VR4122.
	* config/mips/t-vr (LIB2FUNCS_STATIC_EXTRA): Define instead of
	LIB2FUNCS_EXTRA.  Add config/mips/vr4122-div.S.
	* config/mips/vr4122-div.S: New file.
	* doc/invoke.texi: Document -mfix-vr4122-bugs.

Co-Authored-By: Richard Sandiford <rsandifo@redhat.com>

From-SVN: r79912