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

GWP-ASan is part of the native allocator, and may allocate some memory.
When GWP-ASan is enabled, the malloc tests need to look inside of
GWP-ASan regions as well for native allocations.

Bug: 135634846
Test: atest bionic-unit-tests
Change-Id: Ibb78f9c9e7e96a437cffce013facd18708799b0e
diff --git a/tests/malloc_stress_test.cpp b/tests/malloc_stress_test.cpp
index 6c5cc06..b5b06ab 100644
--- a/tests/malloc_stress_test.cpp
+++ b/tests/malloc_stress_test.cpp
@@ -74,7 +74,8 @@
     uint64_t rss_bytes = 0;
     uint64_t vss_bytes = 0;
     for (auto& vma : maps) {
-      if (vma.name == "[anon:libc_malloc]" || android::base::StartsWith(vma.name, "[anon:scudo:")) {
+      if (vma.name == "[anon:libc_malloc]" || android::base::StartsWith(vma.name, "[anon:scudo:") ||
+          android::base::StartsWith(vma.name, "[anon:GWP-ASan")) {
         android::meminfo::Vma update_vma(vma);
         ASSERT_TRUE(proc_mem.FillInVmaStats(update_vma));
         rss_bytes += update_vma.usage.rss;