[scudo] Move the decision making of page release to hasChanceToReleasePages()

This change is only in SizeClassAllocator32. SizeClassAllocator64 has
it implemented.

Reviewed By: cferris

Differential Revision: https://reviews.llvm.org/D158456

GitOrigin-RevId: 56241b65ce7659c97b7ab428bc1447d9ba62be6e
1 file changed