Craig Topper a7eae62a42 [SelectionDAG][X86][PowerPC][Mips] Replace the default implementation of LowerOperationWrapper with the X86 and PowerPC version. ...

The default version only works if the returned node has a single
result. The X86 and PowerPC versions support multiple results
and allow a single result to be returned from a node with
multiple outputs. And allow a single result that is not result 0
of the node.

Also replace the Mips version since the new version should work
for it. The original version handled multiple results, but only
if the new node and original node had the same number of results.

Differential Revision: https://reviews.llvm.org/D91846

2020-11-20 10:06:53 -08:00

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