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[COFF] Move type merging to TpiSource::mergeDebugT virtual method

Authored by rnk on Sat, May 9, 6:58 AM.

Description

[COFF] Move type merging to TpiSource::mergeDebugT virtual method

This paves the way to doing more things in parallel, and allows us to
order type sources in dependency order. PDBs and PCH objects have to be
loaded before object files which use them.

This is a rebase of the unapplied remaining changes in
https://reviews.llvm.org/D59226. I found it very challenging to rebase
this across the LLD variable name style change. I recall there was a
tool for that, but I didn't take the time to use it.

Reviewers: aganea, akhuang

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D79672

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