Avoid scaning the used region if there are no free units #81525
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This PR implements a simple optimization to avoid scanning the used regions if we knew the number of free units is not enough to fit the allocation.
Allocating a new region is a relatively rare operation, but it is used extensively when starting a NoGC region. This should help the performance for
TryStartNoGCRegion, especially for the large ones.Here is the validation done for the PR.