[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 1abf1ab6a6975bc85d3c0dde645c0e32f77af979..2fbe9ed995ca0865628e136f261a0af7a931258a 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,