* gcc.target/mips/ext_ins.c: New test for testing the generation

* gcc.target/mips/ext_ins.c: New test for testing the generation
of MIPS32/64 rev 2 ext/ins instructions.

* config/mips/mips.c (mips_use_ins_ext_p): New helper function
that determines whether the MIPS32/64 R2 ext/ins should be used.
* config/mips/mips.h (ISA_HAS_EXT_INS): New macro.
* config/mips/mips.md (extzv): Changed predicate for operand to
nonimmediate_operand. Add code to generate insn patterns for
extzvsi and extzvdi.
(extzv<mode>): New pattern to match mips32/64 r2 ext insn.
(insv): Similarly for insertion.
(insv<mode>): Similarly.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100212 138bc75d-0d04-0410-961f-82ee72b054a4