Reland: Introduce a V8_NORETURN macro and use it to make GCC 4.9.2 happy again.

test/cctest/test-atomicops.cc

Index: test/cctest/test-atomicops.cc
diff --git a/test/cctest/test-atomicops.cc b/test/cctest/test-atomicops.cc
index 8b47208ba0adfc2d20bda437e187bf7115613b66..4a59ba68e364cd8d14d097ff2ec904dd46dc77f5 100644
--- a/test/cctest/test-atomicops.cc
+++ b/test/cctest/test-atomicops.cc
@@ -157,21 +157,11 @@ static void TestAtomicExchange() {
 
 template <class AtomicType>
 static void TestAtomicIncrementBounds() {
-  // Test at rollover boundary between int_max and int_min.
-  AtomicType test_val =
-      static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) - 1);
-  AtomicType value = -1 ^ test_val;
-  AtomicType new_value = NoBarrier_AtomicIncrement(&value, 1);
-  CHECK_EQU(test_val, value);
-  CHECK_EQU(value, new_value);
-
-  NoBarrier_AtomicIncrement(&value, -1);
-  CHECK_EQU(-1 ^ test_val, value);
-
   // Test at 32-bit boundary for 64-bit atomic type.
-  test_val = static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) / 2);
-  value = test_val - 1;
-  new_value = NoBarrier_AtomicIncrement(&value, 1);
+  AtomicType test_val = static_cast<AtomicType>(1)
+                        << (NUM_BITS(AtomicType) / 2);
+  AtomicType value = test_val - 1;
+  AtomicType new_value = NoBarrier_AtomicIncrement(&value, 1);
   CHECK_EQU(test_val, value);
   CHECK_EQU(value, new_value);