[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/compiler/mips64/instruction-selector-mips64.cc

Index: src/compiler/mips64/instruction-selector-mips64.cc
diff --git a/src/compiler/mips64/instruction-selector-mips64.cc b/src/compiler/mips64/instruction-selector-mips64.cc
index 1b12bd9aec745fef5fd65f9b7c498f5c64e6b115..b48cccc351c7dec19edcab0912346d5684c33384 100644
--- a/src/compiler/mips64/instruction-selector-mips64.cc
+++ b/src/compiler/mips64/instruction-selector-mips64.cc
@@ -812,6 +812,11 @@ void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
+  VisitRR(this, kMips64TruncWS, node);
+}
+
+
 void InstructionSelector::VisitChangeFloat64ToInt32(Node* node) {
   Mips64OperandGenerator g(this);
   Node* value = node->InputAt(0);