[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/compiler/mips/instruction-selector-mips.cc

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index 61cea76b22cc5c9a4f8a9c9f9250a3bfa7f80478..6a95ca8ad63bdcb76a14fc2a111c3639dc269b6a 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -513,6 +513,11 @@ void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
+  VisitRR(this, kMipsTruncWS, node);
+}
+
+
 void InstructionSelector::VisitChangeFloat64ToInt32(Node* node) {
   MipsOperandGenerator g(this);
   Node* value = node->InputAt(0);