MIPS/GCC: Mark text contents as code or data

	gcc/
	* config/mips/mips-protos.h (mips_set_text_contents_type): New
	prototype.
	* config/mips/mips.h (ASM_OUTPUT_BEFORE_CASE_LABEL): New macro.
	(ASM_OUTPUT_CASE_END): Likewise.
	* config/mips/mips.c (mips_set_text_contents_type): New
	function.
	(mips16_emit_constants): Record the pool's initial label number
	with the `consttable' insn.  Emit a `consttable_end' insn at the
	end.
	(mips_final_prescan_insn): Call `mips_set_text_contents_type'
	for `consttable' insns.
	(mips_final_postscan_insn): Call `mips_set_text_contents_type'
	for `consttable_end' insns.
	* config/mips/mips.md (unspec): Add UNSPEC_CONSTTABLE_END enum
	value.
	(consttable): Add operand.
	(consttable_end): New insn.

	gcc/testsuite/
	* gcc.target/mips/data-sym-jump.c: New test case.
	* gcc.target/mips/data-sym-pool.c: New test case.
	* gcc.target/mips/insn-pseudo-4.c: Adjust for constant pool
	annotation.

From-SVN: r242502