MIPS: Update the gap resolver to support Smi constants.

src/mips/lithium-gap-resolver-mips.cc

Index: src/mips/lithium-gap-resolver-mips.cc
diff --git a/src/mips/lithium-gap-resolver-mips.cc b/src/mips/lithium-gap-resolver-mips.cc
index 87efae5f4df6aead3e356bda21a14a2161e614c8..23a8f32f76ee41b4e33b7e9cc55fc53a0e5981d2 100644
--- a/src/mips/lithium-gap-resolver-mips.cc
+++ b/src/mips/lithium-gap-resolver-mips.cc
@@ -252,7 +252,9 @@ void LGapResolver::EmitMove(int index) {
     LConstantOperand* constant_source = LConstantOperand::cast(source);
     if (destination->IsRegister()) {
       Register dst = cgen_->ToRegister(destination);
-      if (cgen_->IsInteger32(constant_source)) {
+      if (cgen_->IsSmi(constant_source)) {
+        __ li(dst, Operand(cgen_->ToSmi(constant_source)));
+      } else if (cgen_->IsInteger32(constant_source)) {
         __ li(dst, Operand(cgen_->ToInteger32(constant_source)));
       } else {
         __ LoadObject(dst, cgen_->ToHandle(constant_source));
@@ -260,7 +262,9 @@ void LGapResolver::EmitMove(int index) {
     } else {
       ASSERT(destination->IsStackSlot());
       ASSERT(!in_cycle_);  // Constant moves happen after all cycles are gone.
-      if (cgen_->IsInteger32(constant_source)) {
+      if (cgen_->IsSmi(constant_source)) {
+        __ li(kLithiumScratchReg, Operand(cgen_->ToSmi(constant_source)));
+      } else if (cgen_->IsInteger32(constant_source)) {
         __ li(kLithiumScratchReg,
               Operand(cgen_->ToInteger32(constant_source)));
       } else {