[ARM] Add NEON instructions for implementing SIMD.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 5a0a2b67947397a3d2c555bb597d5a53d419091c..1bee1ed4122009b82afb9a74561f0eb5f5b164bb 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -568,6 +568,8 @@ class MacroAssembler: public Assembler {
                    NeonDataType dt, int lane);
   void ReplaceLane(QwNeonRegister dst, QwNeonRegister src,
                    SwVfpRegister src_lane, Register scratch, int lane);
+  void Swizzle(QwNeonRegister dst, QwNeonRegister src, Register scratch,
+               NeonSize size, uint32_t lanes);
 
   void LslPair(Register dst_low, Register dst_high, Register src_low,
                Register src_high, Register scratch, Register shift);