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[PATCH, middle-end]: Introduce TARGET_LEGITIMATE_COMBINED_INSN target hook

Hello!

Actually a v3 of TARGET_REJECT_COMBINED_INSN target hook.

Changes:
- rename the hook and reverse the return value

2012-08-25  Uros Bizjak  <ubizjak@gmail.com>

	* target.def (legitimate_combined_insn): New target hook.
	* doc/tm.texi.in (TARGET_LEGITIMATE_COMBINED_INSN): New hook.
	* doc/tm.texi: Regenerated.
	* combine.c (recog_for_combine): Call targetm.legitimate_combined_insn
	to allow targets to reject combined insn.
	* hooks.h (hook_bool_rtx_true): New.
	* hooks.c (hook_bool_rtx_true): Ditto.

Bootstrapped and regression tested on x86_64-pc-linux-gnu {,-m32},
also with target-dependant x86 patch that implements the hook.

Uros.

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