[llvm-dev] Always running Regular LTO before ThinLTO?

[Arthur Eubanks via llvm-dev]

While debugging a ThinLTO issue, I noticed that passes were running more
often than I expected. This is being invoked pretty normally, something like
$ clang++ -fuse-ld=lld -flto=thin

Looks like at [1] we try to first run regular LTO before running ThinLTO.
Removing the first line makes the link go from 208s to 115s. Is this
expected behavior?

[1]:
https://github.com/llvm/llvm-project/blob/a64ebb8637277998f77e55d335faca6fdcf5859b/llvm/lib/LTO/LTO.cpp#L1033
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