ARM: Avoid VMSR instruction when converting to clamped uint8

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1238 matching lines @@
                     const Condition cond = al);
   void vcvt_f64_f32(const DwVfpRegister dst,
                     const SwVfpRegister src,
                     VFPConversionMode mode = kDefaultRoundToZero,
                     const Condition cond = al);
   void vcvt_f32_f64(const SwVfpRegister dst,
                     const DwVfpRegister src,
                     VFPConversionMode mode = kDefaultRoundToZero,
                     const Condition cond = al);
   void vcvt_f64_s32(const DwVfpRegister dst,
-                    int fraction_bits,
+                    const int fraction_bits,
+                    const Condition cond = al);
+  void vcvt_u32_f64(const DwVfpRegister dst_src,
+                    const int fraction_bits,
                     const Condition cond = al);
 
   void vneg(const DwVfpRegister dst,
             const DwVfpRegister src,
             const Condition cond = al);
   void vabs(const DwVfpRegister dst,
             const DwVfpRegister src,
             const Condition cond = al);
   void vadd(const DwVfpRegister dst,
             const DwVfpRegister src1,
@@ skipping 419 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_