fixes a problem caused by gcc 4.6 optimization (by Paul Pluzhnikov)

src/gtest-death-test.cc

@@ -932,6 +932,11 @@ static int ExecDeathTestChildMain(void* child_arg) {
 // This could be accomplished more elegantly by a single recursive
 // function, but we want to guard against the unlikely possibility of
 // a smart compiler optimizing the recursion away.
+//
+// GTEST_NO_INLINE_ is required to prevent GCC 4.6 from inlining
+// StackLowerThanAddress into StackGrowsDown, which then doesn't give
+// correct answer.
+bool StackLowerThanAddress(const void* ptr) GTEST_NO_INLINE_;
 bool StackLowerThanAddress(const void* ptr) {
   int dummy;
   return &dummy < ptr;