[llvm-commits] patch: copy sret argument into %rax on return with x86-64 abi in fastisel

[Nick Lewycky]

The x86-64 ABI requires that we copy the value in our sret argument into
%rax when returning. The normal X86 ISel has code to do this at
X86ISelLowering.cpp:1583. This patch adds it to fast-isel, fixing PR13563.

Please review!

Nick
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