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x86: re-work insn/suffix recognition
Having templates with a suffix explicitly present has always been quirky. Introduce a 2nd matching pass in case the 1st one couldn't find a suitable template _and_ didn't itself already need to trim off a suffix to find a match at all. This requires error reporting adjustments (albeit luckily fewer than I was afraid might be necessary), as errors previously reported during matching now need deferring until after the 2nd pass (because, obviously, we must not emit any error if the 2nd pass succeeds). While also related to PR gas/29524, it was requested that move-with-sign-extend be left as broken as it always was. PR gas/29525 Note that with the dropped CMPSD and MOVSD Intel Syntax string insn templates taking operands, mixed IsString/non-IsString template groups (with memory operands) cannot occur anymore. With that maybe_adjust_templates() becomes unnecessary (and is hence being removed). PR gas/29526 Note further that while the additions to the intel16 testcase aren't really proper Intel syntax, we've been permitting all of those except for the MOVD variant. The test therefore is to avoid re-introducing such an inconsistency.
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