[llvm] [DTLTO] [LLVM] Initial DTLTO cache implementation (PR #156433)

[Teresa Johnson via llvm-commits]

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teresajohnson wrote:

Just return E here like at https://github.com/llvm/llvm-project/blob/bcb3d2f5122276ed9969fe2b2ef4428652800377/llvm/lib/LTO/LTO.cpp#L1539, and move the stuff below here out of the else block.

https://github.com/llvm/llvm-project/pull/156433