[NFC][Asan] Use GET_CURRENT_FRAME instead of local var

Author: vitalybuka

compiler-rt/lib/asan/asan_fake_stack.cpp

@@ -205,11 +205,12 @@ static FakeStack *GetFakeStackFastAlways() {
 
 static ALWAYS_INLINE uptr OnMalloc(uptr class_id, uptr size) {
   FakeStack *fs = GetFakeStackFast();
-  if (!fs) return 0;
-  uptr local_stack;
-  uptr real_stack = reinterpret_cast<uptr>(&local_stack);
-  FakeFrame *ff = fs->Allocate(fs->stack_size_log(), class_id, real_stack);
-  if (!ff) return 0;  // Out of fake stack.
+  if (!fs)
+    return 0;
+  FakeFrame *ff =
+      fs->Allocate(fs->stack_size_log(), class_id, GET_CURRENT_FRAME());
+  if (!ff)
+    return 0;  // Out of fake stack.
   uptr ptr = reinterpret_cast<uptr>(ff);
   SetShadow(ptr, size, class_id, 0);
   return ptr;
@@ -219,9 +220,8 @@ static ALWAYS_INLINE uptr OnMallocAlways(uptr class_id, uptr size) {
   FakeStack *fs = GetFakeStackFastAlways();
   if (!fs)
     return 0;
-  uptr local_stack;
-  uptr real_stack = reinterpret_cast<uptr>(&local_stack);
-  FakeFrame *ff = fs->Allocate(fs->stack_size_log(), class_id, real_stack);
+  FakeFrame *ff =
+      fs->Allocate(fs->stack_size_log(), class_id, GET_CURRENT_FRAME());
   if (!ff)
     return 0;  // Out of fake stack.
   uptr ptr = reinterpret_cast<uptr>(ff);