[SubZero] Fix f64 to/from i64 moves

src/IceTargetLoweringX86BaseImpl.h

Index: src/IceTargetLoweringX86BaseImpl.h
diff --git a/src/IceTargetLoweringX86BaseImpl.h b/src/IceTargetLoweringX86BaseImpl.h
index 87bbfde8bb55a3f93996abb00fa210df187cf707..3e1fb1de7444f5783543ef294fec490254bb6ad5 100644
--- a/src/IceTargetLoweringX86BaseImpl.h
+++ b/src/IceTargetLoweringX86BaseImpl.h
@@ -4004,9 +4004,6 @@ template <typename TraitsType>
 void TargetX86Base<TraitsType>::lowerIntrinsicCall(
     const InstIntrinsicCall *Instr) {
   switch (Intrinsics::IntrinsicID ID = Instr->getIntrinsicInfo().ID) {
-  default:
-    llvm::report_fatal_error("Unexpected intrinsic");
-    return;
   case Intrinsics::AtomicCmpxchg: {
     if (!Intrinsics::isMemoryOrderValid(
             ID, getConstantMemoryOrder(Instr->getArg(3)),
@@ -6091,6 +6088,7 @@ void TargetX86Base<TraitsType>::lowerShuffleVector(
       auto *T = makeReg(DestTy);
       auto *Src0RM = legalize(Src0, Legal_Reg | Legal_Mem);
       auto *Src1RM = legalize(Src1, Legal_Reg | Legal_Mem);
+      (void)Src1RM;
       _movp(T, Src0RM);
       _punpckl(T, Src0RM);
       _movp(Dest, T);