[PATCH] D97417: [clangd] use a compatible preamble for the first AST built

[Quentin Chateau via Phabricator via cfe-commits]

qchateau created this revision.
qchateau added a reviewer: sammccall.
Herald added subscribers: usaxena95, kadircet, arphaman, javed.absar.
qchateau requested review of this revision.
Herald added subscribers: cfe-commits, MaskRay, ilya-biryukov.
Herald added a project: clang.

Keep a store of the preambles of all opened filed, plus up to
5 previously used preambles. When building the AST for a TU,
if the preamble for this TU is not yet built, look through
the stored premables to find the best compatible preamble
and use this preamble to speed-up the AST build.

---------

This patch is starting to look like something acceptable, so
I'm sending it for review. At this point I'd like to get some 
feedback on this before going further.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97417

Files:
  clang-tools-extra/clangd/ParsedAST.cpp
  clang-tools-extra/clangd/TUScheduler.cpp
  clang-tools-extra/clangd/TUScheduler.h

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