Fix VS2005 build.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index f6be6a1285107113413c24e1bb0338f25e6fbc26..2b738e9a40e551db2a3557be537f436c6e17fceb 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4789,8 +4789,8 @@ void LCodeGen::EmitDeepCopy(Handle<JSObject> object,
       for (int i = 0; i < elements_length; i++) {
         int64_t value = double_array->get_representation(i);
         // We only support little endian mode...
-        int32_t value_low = value & 0xFFFFFFFF;
-        int32_t value_high = value >> 32;
+        int32_t value_low = static_cast<int32_t>(value & 0xFFFFFFFF);
+        int32_t value_high = static_cast<int32_t>(value >> 32);
         int total_offset =
             elements_offset + FixedDoubleArray::OffsetOfElementAt(i);
         __ li(a2, Operand(value_low));