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parallelTransformReduce is modelled on the C++17 pstl API of std::transform_reduce, except our wrappers do not use execution policy parameters. parallelForEachError allows loops that contain potentially failing operations to propagate errors out of the loop. This was one of the major challenges I encountered while parallelizing PDB type merging in LLD. Parallelizing a loop with parallelForEachError is not behavior preserving: the loop will no longer stop on the first error, it will continue working and report all errors it encounters in a list. I plan to use this to propagate errors out of LLD's coff::TpiSource::remapTpiWithGHashes, which currently stores errors an error in the TpiSource object. Differential Revision: https://reviews.llvm.org/D90639
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