MIPS64: Unbreak cross build.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index caa21cabe461ca724b19ad47379ee0355f6fdbed..03f85350cb5a8fa23486af5d4fdc08aed05c012c 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -3271,7 +3271,8 @@ void MacroAssembler::PushStackHandler() {
 void MacroAssembler::PopStackHandler() {
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
   pop(a1);
-  Daddu(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize));
+  Daddu(sp, sp, Operand(static_cast<int64_t>(StackHandlerConstants::kSize -
+                                             kPointerSize)));
   li(at, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
   sd(a1, MemOperand(at));
 }