[MemCpyOpt] Forward memcpy source to load instruction #138490
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Fixes #137810.
A headache compiling time. :/
This PR is only for the context of subsequent PRs.
Perhaps a cheaper check should be implemented in InstCombine.
https://llvm-compile-time-tracker.com/compare.php?from=cfb9991c0812cde4afc3dc1b84221814a0e8b0ff&to=0fd9da5b5a0c53a90181451f63e0f6fd90b218f8&stat=instructions:u