Martin Kustermann
75e0837f3e
The logic for background compiler can be simplified due to:
* we only have one bg compiler
* it always optimizes
* it is allocated at isolate startup and freed on isolate shutdown
* an existing check in the compiler for whether the BG compiler is
disabled is racy and therefore not helpful
* when a mutator communicates with BG compiler it will use
SafepointMutexLocker instead of MutexLocker
This CL also ecapsulates disabling the BG compiler via a
NoBackgroundCompilerScope object. It allows nested disabling and guards
against races.
Issue https://github.com/dart-lang/sdk/issues/36097
TEST=Refactoring of existing code.
Change-Id: I36ed6592c9a8b91e94181698b7de662b4ee984e9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/183400
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
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