[RFA/ARM 04/21] Warn on deprecated IT blocks.

[Matthew Gretton-Dann]

ARMv8 deprecates various forms of IT blocks.  This patch adds warnings
for these cases.

The IT block forms deprecated are:
 * Those with more than one instruction in the IT block
 * Those with a 32-bit instruction in the IT block
 * Various 16-bit instructions (mostly involving PC).

This patch does not change the handling of automatic IT block generation.
This is to be done in a later patch.

gas/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* config/tc-arm.c (do_t_it): Fully initialise now_it.
	(new_automatic_it_block): Likewise.
	(handle_it_block): Record whether current instruction is
	conditionally executed.
	* config/tc-arm.c (depr_insn_mask): New structure.
	(depr_it_insns): New variable.
	(it_fsm_post_encode): Warn on deprecated uses.
	* config/tc-arm.h (current_it): Add new fields.

gas/testsuite/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* gas/arm/armv8-a-it-bad.d: New testcase.
	* gas/arm/armv8-a-it-bad.l: Likewise.
	* gas/arm/armv8-a-it-bad.s: Likewise.
	* gas/arm/ldr-t-bad.s: Update testcase.
	* gas/arm/ldr-t.d: Likewise.
	* gas/arm/ldr-t.s: Likewise.
	* gas/arm/neon-cond-bad-inc.s: Likewise.
	* gas/arm/sp-pc-validations-bad-t: Likewise.
	* gas/arm/vfp-fma-inc.s: Likewise.
	* gas/arm/vfp-neon-syntax-inc.s: Likewise.
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