Avoid excessive allocation of std::set<> nodes in SwapSpace.
This does not affect the overall memory usage but avoids
a lot of deallocations followed by allocation.
Measured compilation of a big app using heap track:
bytes allocated in total (ignoring deallocations): 4.14GB -> 4.04GB
calls to allocation functions:
21662554 ->
19545823
Test: m test-art-host-gtest
Test: Manually check that oat file for the big app remains identical.
Bug:
34053922
Change-Id: I00568422ba5510550986e29f30bace9ae6245269
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