[turbofan] Add TruncateFloat32ToUint32 operator to Turbofan.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 68aba0d371c523cdb0ee68b4a9999efecbceccde..3af5f05941024eda37927a0d8e309374880f4203 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -954,6 +954,15 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
         __ Cvttss2si(i.OutputRegister(), i.InputOperand(0));
       }
       break;
+    case kSSEFloat32ToUint32: {
+      if (instr->InputAt(0)->IsDoubleRegister()) {
+        __ Cvttss2siq(i.OutputRegister(), i.InputDoubleRegister(0));
+      } else {
+        __ Cvttss2siq(i.OutputRegister(), i.InputOperand(0));
+      }
+      __ AssertZeroExtended(i.OutputRegister());
+      break;
+    }
     case kSSEFloat64Cmp:
       ASSEMBLE_SSE_BINOP(Ucomisd);
       break;