re PR middle-end/33699 (missing optimization on const addr area store)

re PR middle-end/33699 (missing optimization on const addr area store)

	PR middle-end/33699
	* target.h (struct gcc_target): Fix indentation.  Add
	const_anchor.
	* target-def.h (TARGET_CONST_ANCHOR): New macro.
	(TARGET_INITIALIZER): Use it.
	* cse.c (CHEAPER): Move it up to the other macros.
	(insert): Rename this ...
	(insert_with_costs): ... to this.  Add cost parameters.  Update
	function comment.
	(insert): New function.  Call insert_with_costs.
	(compute_const_anchors, insert_const_anchor, insert_const_anchors,
	find_reg_offset_for_const, try_const_anchors): New functions.
	(cse_insn): Call try_const_anchors.  Adjust cost of src_related
	when using a const-anchor.  Call insert_const_anchors.
	* config/mips/mips.c (mips_set_mips16_mode): Set
	targetm.const_anchor.
	* doc/tm.texi (Misc): Document TARGET_CONST_ANCHOR.

testsuite/
	* gcc.target/mips/const-anchor-1.c: New test.
	* gcc.target/mips/const-anchor-2.c: New test.

From-SVN: r147944