Prevent clang from optimizing away 2 variables.

base/tools_sanity_unittest.cc

Index: base/tools_sanity_unittest.cc
diff --git a/base/tools_sanity_unittest.cc b/base/tools_sanity_unittest.cc
index 64a9ca68f1878431713960c7a2a41a95abacbfa2..661b58e44ec98f0c4fad0126ada8d6bb2c2fdc1c 100644
--- a/base/tools_sanity_unittest.cc
+++ b/base/tools_sanity_unittest.cc
@@ -84,7 +84,8 @@ TEST(ToolsSanityTest, ArrayDeletedWithoutBraces) {
   if (!RunningOnValgrind())
     return;
 
-  int *foo = new int[10];
+  // Without the |volatile|, clang optimizes away the next two lines.
+  int* volatile foo = new int[10];
   delete foo;
 }
 
@@ -93,7 +94,8 @@ TEST(ToolsSanityTest, SingleElementDeletedWithBraces) {
   if (!RunningOnValgrind())
     return;
 
-  int *foo = new int;
+  // Without the |volatile|, clang optimizes away the next two lines.
+  int* volatile foo = new int;
   delete [] foo;
 }