[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index db6512388553941876a79db10c7ec3fbb5e59e1f..e0cfe8c36318d94914b81244ad34b3c52938f358 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1125,6 +1125,10 @@ class Assembler : public AssemblerBase {
                     const SwVfpRegister src,
                     VFPConversionMode mode = kDefaultRoundToZero,
                     const Condition cond = al);
+  void vcvt_s32_f32(const SwVfpRegister dst,
+                    const SwVfpRegister src,
+                    VFPConversionMode mode = kDefaultRoundToZero,
+                    const Condition cond = al);
   void vcvt_s32_f64(const SwVfpRegister dst,
                     const DwVfpRegister src,
                     VFPConversionMode mode = kDefaultRoundToZero,