[PATCH] D76099: [Clang][Driver] In -fintegrated-cc1 mode, avoid crashing on exit after a compiler crash

[Alexandre Ganea via Phabricator via cfe-commits]

aganea created this revision.
aganea added reviewers: rnk, hans, hubert.reinterpretcast, daltenty.
Herald added subscribers: llvm-commits, cfe-commits, hiraditya.
Herald added projects: clang, LLVM.

As reported here: https://reviews.llvm.org/D69825#1916865 and in PR45164, in case of a compiler crash, Clang now reports a second crash related to TimerGroups. The crash is caused by the TimerGroup's internal linked list which still points to already freed stack frames, which were unwind by `longjmp()` (or SEH on Windows) after the first compiler crash.

There's a second crash, not seen in PR45164, which happens when `llvm_shutdown` is called: the static `DefaultTimerGroup` object is destroyed which causes more iterating through the TimerGroups.

With this patch, we now 'steal' the `TimeGroup` instance from `DefaultTimerGroup` and prevent any further iteration of the timers after the initial crash.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D76099

Files:
  clang/lib/Lex/Pragma.cpp
  clang/tools/driver/driver.cpp
  llvm/include/llvm/Support/ManagedStatic.h
  llvm/include/llvm/Support/Timer.h
  llvm/lib/Support/Timer.cpp

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