[turbofan] Add TruncateFloat32ToUint32 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 8651bbb1246e8dd167819d9909d3ec242ace7dbe..deba9677a3456c2b49b006d6e51e424a87375cf4 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -523,6 +523,11 @@ void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToUint32(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitChangeFloat64ToInt32(Node* node) {
   MipsOperandGenerator g(this);
   Node* value = node->InputAt(0);