[GWP-ASan] Scan GWP-ASan regions in maps.

GWP-ASan is part of the native allocator, and may allocate some memory.
If a trace comes from a GWP-ASan sampled process, we need to identify
GWP-ASan allocations as from the native heap.

Bug: 135634846
Test: atest memory_replay_tests
Change-Id: Icd1122130a30af5604554a62d270dc1967117570