[GlobalISel]: Fix a bug where we could dereference None
getConstantVRegVal returns None when dealing with constants > 64 bits. Don't assume we always have a value in GISelKnownBits. llvm-svn: 371465
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getConstantVRegVal returns None when dealing with constants > 64 bits. Don't assume we always have a value in GISelKnownBits. llvm-svn: 371465