[asan] more renaming

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@157747 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_allocator.h b/lib/asan/asan_allocator.h
index eee5901..2aed598 100644
--- a/lib/asan/asan_allocator.h
+++ b/lib/asan/asan_allocator.h
@@ -60,8 +60,8 @@
   uptr magic;  // Modified by the instrumented code.
   uptr descr;  // Modified by the instrumented code.
   FakeFrame *next;
-  uint64_t real_stack     : 48;
-  uint64_t size_minus_one : 16;
+  u64 real_stack     : 48;
+  u64 size_minus_one : 16;
 };
 
 struct FakeFrameFifo {