[ARM] Add Neon shift instructions vshl, vshr.

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 639030035a8dd3662423ab34a30d0912a89af675..d4f94029697905f6b91ae9ae728f19df380b4b6d 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1387,6 +1387,8 @@ class Assembler : public AssemblerBase {
   void vmax(QwNeonRegister dst, QwNeonRegister src1, QwNeonRegister src2);
   void vmax(NeonDataType dt, QwNeonRegister dst,
             QwNeonRegister src1, QwNeonRegister src2);
+  void vshl(NeonDataType dt, QwNeonRegister dst, QwNeonRegister src, int shift);
+  void vshr(NeonDataType dt, QwNeonRegister dst, QwNeonRegister src, int shift);
   // vrecpe and vrsqrte only support floating point lanes.
   void vrecpe(QwNeonRegister dst, QwNeonRegister src);
   void vrsqrte(QwNeonRegister dst, QwNeonRegister src);