[NFC] [sanitizers] leave BufferedStackTrace uninit in tests

This is for consistency with the production code

Pull Request: #102251

Author: fmayer

compiler-rt/lib/asan/tests/asan_noinst_test.cpp

@@ -137,7 +137,7 @@ TEST(AddressSanitizer, DISABLED_InternalPrintShadow) {
 }
 
 TEST(AddressSanitizer, QuarantineTest) {
-  BufferedStackTrace stack;
+  UNINITIALIZED BufferedStackTrace stack;
   stack.trace_buffer[0] = 0x890;
   stack.size = 1;
 
@@ -159,7 +159,7 @@ TEST(AddressSanitizer, QuarantineTest) {
 void *ThreadedQuarantineTestWorker(void *unused) {
   (void)unused;
   u32 seed = my_rand();
-  BufferedStackTrace stack;
+  UNINITIALIZED BufferedStackTrace stack;
   stack.trace_buffer[0] = 0x890;
   stack.size = 1;
 
@@ -194,7 +194,7 @@ TEST(AddressSanitizer, ThreadedQuarantineTest) {
 
 void *ThreadedOneSizeMallocStress(void *unused) {
   (void)unused;
-  BufferedStackTrace stack;
+  UNINITIALIZED BufferedStackTrace stack;
   stack.trace_buffer[0] = 0x890;
   stack.size = 1;
   const size_t kNumMallocs = 1000;
@@ -238,7 +238,7 @@ static void TestLoadStoreCallbacks(CB cb[2][5]) {
   uptr buggy_ptr;
 
   __asan_test_only_reported_buggy_pointer = &buggy_ptr;
-  BufferedStackTrace stack;
+  UNINITIALIZED BufferedStackTrace stack;
   stack.trace_buffer[0] = 0x890;
   stack.size = 1;
 

compiler-rt/lib/sanitizer_common/tests/sanitizer_stacktrace_test.cpp

@@ -259,7 +259,7 @@ TEST_F(StackPrintDeathTest, SKIP_ON_SPARC(RequiresNonNullBuffer)) {
 #endif // SANITIZER_CAN_FAST_UNWIND
 
 TEST(SlowUnwindTest, ShortStackTrace) {
-  BufferedStackTrace stack;
+  UNINITIALIZED BufferedStackTrace stack;
   uptr pc = StackTrace::GetCurrentPc();
   uptr bp = GET_CURRENT_FRAME();
   stack.Unwind(pc, bp, nullptr, false, /*max_depth=*/0);