[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_win.cc b/lib/asan/asan_win.cc
index b5f1b30..679147e 100644
--- a/lib/asan/asan_win.cc
+++ b/lib/asan/asan_win.cc
@@ -234,7 +234,7 @@
   return InterlockedExchangeAdd((LONG*)a, 1) + 1;
 }
 
-uint16_t AtomicExchange(uint16_t *a, uint16_t new_val) {
+u16 AtomicExchange(u16 *a, u16 new_val) {
   // InterlockedExchange16 seems unavailable on some MSVS installations.
   // Everybody stand back, I pretend to know inline assembly!
   // FIXME: I assume VC is smart enough to save/restore eax/ecx?