MIPS: Fix int64->int32 lowering in wasm-to-interpeter entry on big-endian archs.

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index acc06d3afaaddffc4e55fbdf902b956a9cdaf541..f6e50e519196235738f1e167d3bae605177a99a3 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -520,6 +520,15 @@ const int kMinComplexMemCopy = 8;
 // ----------------------------------------------------------------------------
 // Miscellaneous
 
+// Memory offset for lower and higher bits in a 64 bit integer.
+#if defined(V8_TARGET_LITTLE_ENDIAN)
+static const int kInt64LowerHalfMemoryOffset = 0;
+static const int kInt64UpperHalfMemoryOffset = 4;
+#elif defined(V8_TARGET_BIG_ENDIAN)
+static const int kInt64LowerHalfMemoryOffset = 4;
+static const int kInt64UpperHalfMemoryOffset = 0;
+#endif  // V8_TARGET_LITTLE_ENDIAN
+
 // A static resource holds a static instance that can be reserved in
 // a local scope using an instance of Access.  Attempts to re-reserve
 // the instance will cause an error.