[llvm-commits] [PATCH] improve ARM halt encoding

[JF Bastien]

I've attached a patch from PNaCl with changes the ARM halt encoding so that
it also looks like a halt in Thumb. This can catch bugs when executing ARM
code as Thumb, whether it be in the context of compiler/JIT bugs, or an
attacker trying to get validated ARM code to execute as Thumb (which is a
concern for PNaCl).

Note that the instruction itself isn't changing (it's still UDF), only the
immediate.
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