[Patch] [Thumbv8] Prevent bundling inst that sets CPSR

[Weiming Zhao]

Hi,

 

Currently, for thumbv8, an extra pass "Thumb2SizeReduction" is run before
IfConv. 

However, Thumb2SizeReduction may set CPSR for converted instrs (e.g. mul ->
muls) and  such instrs may get bundled later on in IfConv pass, which causes
some illegal instructions. See http://llvm.org/bugs/show_bug.cgi?id=18370

 

This patch adds checks for the eligibility of IT blocks: if an instruction
already sets CPSR, then don't bundle it. Please help to review it.

 

Thanks,

Weiming

 

 

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