Fix int64 lowering on big-endian architectures.

src/compiler/int64-lowering.h

Index: src/compiler/int64-lowering.h
diff --git a/src/compiler/int64-lowering.h b/src/compiler/int64-lowering.h
index 054c4219948bb640fc4bc43adb89f655046c4987..1a298d2f608007db69e0f27d96e1d2d3e0adfdc6 100644
--- a/src/compiler/int64-lowering.h
+++ b/src/compiler/int64-lowering.h
@@ -26,6 +26,22 @@ class Int64Lowering {
   static int GetParameterCountAfterLowering(
       Signature<MachineRepresentation>* signature);
 
+  static int GetLowerWordOffset() {

[titzer, 2016/06/21 21:22:59]

Can you move these into the CC file?

+#if defined(V8_TARGET_LITTLE_ENDIAN)
+    return 0;
+#elif defined(V8_TARGET_BIG_ENDIAN)
+    return 4;
+#endif
+  }
+
+  static int GetHigherWordOffset() {
+#if defined(V8_TARGET_LITTLE_ENDIAN)
+    return 4;
+#elif defined(V8_TARGET_BIG_ENDIAN)
+    return 0;
+#endif
+  }
+
  private:
   enum class State : uint8_t { kUnvisited, kOnStack, kVisited };