tree a20a7d5caabc6242dec38b6671d7f85efb929bb6
parent 91764583f235edaa719c4c1808a9dc9fc4c9db37
author Hans Wennborg <hans@hanshq.net> 1533291823 +0000
committer Hans Wennborg <hans@hanshq.net> 1533291823 +0000

Merging r338762:
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r338762 | gbiv | 2018-08-02 21:50:27 +0200 (Thu, 02 Aug 2018) | 15 lines

[Support] Add an enable bit to our DebugCounters

r337748 made us start incrementing DebugCounters all of the time. This
makes tsan unhappy in multithreaded environments.

Since it doesn't make much sense to use DebugCounters with multiple
threads, this patch makes us only count anything if the user passed a
-debug-counter option or if some other piece of code explicitly asks
for it (e.g. the pass in D50031).

The amount of global state here makes writing a unittest for this
behavior somewhat awkward. So, no test is provided.

Differential Revision: https://reviews.llvm.org/D50150

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llvm-svn: 338846