1163663 - Assert that the GC is not run during a CC in unexpected places

Status: NEW

(Core :: Cycle Collector, defect)

Description

[Andrew McCreight [:mccr8]]

The GC should not be run during the CC, from the part in BeginCollection where we trace JS roots, up through ScanRoots.  Running GC during Unlink probably is okay.

Jon said there are a few RAII classes we could use to detect this: "AutoAssertOnGC - asserts if we GC
AutoAssertNoAlloc - asserts if we could possibly GC, even if we don't
AutoCheckCannotGC - asserts if we GC, and makes the analysis check too"

AutoAssertNoAlloc is probably what we want.