Skip the malloc_slack test on native bridge.

The allocator for the native bridge is not necessarily going to
allocate the slack data.

Bug: 202428612

Test: Ran on non-native bridge and verified test isn't skipped.
Test: Ran on native bridge and verified test is skipped.
Change-Id: Ia1555be0e9f55896af7ca81830605367133c44a1
(cherry picked from commit 7c0ce86a00433159dfc5dc7164feb752d094dff4)

tests/malloc_test.cpp

diff --git a/tests/malloc_test.cpp b/tests/malloc_test.cpp
index d73f243..30da5c3 100644
--- a/tests/malloc_test.cpp
+++ b/tests/malloc_test.cpp
@@ -1355,6 +1355,8 @@
 
 TEST(malloc, allocation_slack) {
 #if defined(__BIONIC__)
+  SKIP_WITH_NATIVE_BRIDGE;  // http://b/189606147
+
   bool allocator_scudo;
   GetAllocatorVersion(&allocator_scudo);
   if (!allocator_scudo) {