base: disable one partalloc unit test under mac-arm64

This test broke on mac-arm64 between  r833059 and r833159. It will be
re-enabled as part of fixing the linked bug.

Bug: 1154345
Change-Id: I17ffe033b1e1541a62b0ba5d0b4c5ae4670522e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572998Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833872}

base/allocator/partition_allocator/partition_alloc_unittest.cc

@@ -1056,7 +1056,13 @@ TEST_F(PartitionAllocTest, Realloc) {
 }
 
 // Tests the handing out of freelists for partial slot spans.
-TEST_F(PartitionAllocTest, PartialPageFreelists) {
+#if defined(OS_MAC) && defined(ARCH_CPU_ARM64)
+// Bulk-disabled on mac-arm64 for bot stabilization: https://crbug.com/1154345
+#define MAYBE_PartialPageFreelists DISABLED_PartialPageFreelists
+#else
+#define MAYBE_PartialPageFreelists PartialPageFreelists
+#endif
+TEST_F(PartitionAllocTest, MAYBE_PartialPageFreelists) {
   size_t big_size = SystemPageSize() - kExtraAllocSize;
   size_t bucket_index = SizeToIndex(big_size + kExtraAllocSize);
   PartitionRoot<ThreadSafe>::Bucket* bucket =