MIPS/GCC: Mark trailing labels with `.insn'

	gcc/
	* config/mips/mips.c (mips16_emit_constants): Emit `consttable'
	insn at the beginning of the constant pool.
	(mips_insert_insn_pseudos): New function.
	(mips_machine_reorg2): Call it.
	* config/mips/mips.md (unspec): Add UNSPEC_CONSTTABLE and
	UNSPEC_INSN_PSEUDO enum values.
	(insn_pseudo, consttable): New insns.

	gcc/testsuite/
	* gcc.target/mips/insn-casesi.c: New test case.
	* gcc.target/mips/insn-pseudo-1.c: New test case.
	* gcc.target/mips/insn-pseudo-2.c: New test case.
	* gcc.target/mips/insn-pseudo-3.c: New test case.
	* gcc.target/mips/insn-pseudo-4.c: New test case.
	* gcc.target/mips/insn-tablejump.c: New test case.

From-SVN: r242424