[turbofan] Add TruncateFloat32ToUint32 operator to Turbofan.

src/arm/assembler-arm.cc

Index: src/arm/assembler-arm.cc
diff --git a/src/arm/assembler-arm.cc b/src/arm/assembler-arm.cc
index 123d8f4105969e0fca745f0fa8b0d4f1393ba08f..be64e37484a6a0bfd6091c90f8380b9c318dab1e 100644
--- a/src/arm/assembler-arm.cc
+++ b/src/arm/assembler-arm.cc
@@ -2929,6 +2929,12 @@ void Assembler::vcvt_s32_f32(const SwVfpRegister dst, const SwVfpRegister src,
 }
 
 
+void Assembler::vcvt_u32_f32(const SwVfpRegister dst, const SwVfpRegister src,
+                             VFPConversionMode mode, const Condition cond) {
+  emit(EncodeVCVT(U32, dst.code(), F32, src.code(), mode, cond));
+}
+
+
 void Assembler::vcvt_s32_f64(const SwVfpRegister dst,
                              const DwVfpRegister src,
                              VFPConversionMode mode,