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The Microsoft-extension _MoveToCoprocessor and _MoveToCoprocessor2
builtins take the register value to be moved as the first argument,
but the corresponding mcr and mcr2 LLVM intrinsics expect that value
to be the third argument. Handle this as a special case, while still
leaving those intrinsics as generic MSBuiltins. I considered the
alternative of handling these in EmitARMBuiltinExpr, but that does
not work well for the follow-up change that I'm going to make to improve
the error handling for PR22560 -- we need the GetBuiltinType() checks
for ICEArguments, and the ARM version of that code is only used for
Neon intrinsics where the last argument is special and not
checked in the normal way.
llvm-svn: 240462
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