[turbofan] Add TruncateFloat32ToUint32 operator to Turbofan.

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index 13ce301560d0be7883981a0037661a05211f4171..f619ddfb138919bb15bb000704cb6d7c45d8028e 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -859,6 +859,13 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     }
+    case kArmVcvtU32F32: {
+      SwVfpRegister scratch = kScratchDoubleReg.low();
+      __ vcvt_u32_f32(scratch, i.InputFloat32Register(0));
+      __ vmov(i.OutputRegister(), scratch);
+      DCHECK_EQ(LeaveCC, i.OutputSBit());
+      break;
+    }
     case kArmVcvtS32F64: {
       SwVfpRegister scratch = kScratchDoubleReg.low();
       __ vcvt_s32_f64(scratch, i.InputFloat64Register(0));