[CodeGen] Fix result type for SMULO/UMULO legalization
On some platforms (like MSP430) the second element of the result
structure for SMULO/UMULO may have a shorter type than the one
returned by SetCC. We need to truncate it to the right type, or
else some incorrect code may be generated later on.
This fixes issue https://github.com/rust-lang/rust/issues/37829
Patch by Vadzim Dambrouski!
Differential Revision: https://reviews.llvm.org/D27154
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288857
91177308-0d34-0410-b5e6-
96231b3b80d8
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