CheckAtomic.cmake: Put all C++ code inside CHECK_CXX_SOURCE_COMPILES.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90685 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/CheckAtomic.cmake b/cmake/modules/CheckAtomic.cmake
index 6c4da66..f40ff4d 100644
--- a/cmake/modules/CheckAtomic.cmake
+++ b/cmake/modules/CheckAtomic.cmake
@@ -2,11 +2,10 @@
 
 INCLUDE(CheckCXXSourceCompiles)
 
+CHECK_CXX_SOURCE_COMPILES("
 #ifdef _MSC_VER
 #include <windows.h>
 #endif
-	
-CHECK_CXX_SOURCE_COMPILES("
 int main() {
 #ifdef _MSC_VER
         volatile LONG val = 1;