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Fix libcall code to not crash or assert looking for an ADJCALLSTACKUP node when it is known that there is no ADJCALLSTACKDOWN to match. Expand i64 multiply when ISD::MULHU is legal for the target. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21214 91177308-0d34-0410-b5e6-96231b3b80d8