Clamp growth-limit within GC critical section

Overlapping GC with heap clamping can cause issues if the GC depends on
the space's size not to change. It's not fully clear due to
unavailability of stack-trace where exactly the issue is. However, it is
confirmed that the cause is GC and ClampGrowthLimit overlapping.

Flag: EXEMPT BUGFIX
Bug: 454457202
Test: manual
Change-Id: I1a60ec4aa0515ca1e81c2fd4d09a8847343012f6