START_ASSERT_SAME_COMPARTMENT calls CurrentThreadIsHeapBusy which does an OOL call where we do a TLS lookup. Compartment checks are Nightly-only but this overhead makes it harder to profile. Here's a patch to just inline CurrentThreadIsHeapBusy in START_ASSERT_SAME_COMPARTMENT.
Attachment #8881984 - Flags: review?(jcoppeard)
Attachment #8881984 - Flags: review?(jcoppeard) → review+
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/e54513aa7922 Inline CurrentThreadIsHeapBusy in START_ASSERT_SAME_COMPARTMENT to avoid a TLS lookup for each compartment check. r=jonco
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