Make FlushICache part of Assembler(Base) and take Isolate as parameter.

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 c54e51df78cb57c146f1f9f815214ca899057e49..817486a230d80148fde6e109c5ee5ef277ff3072 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -659,6 +659,9 @@ const VmovIndex VmovIndexHi = { 1 };
 
 class Assembler : public AssemblerBase {
  public:
+  using AssemblerBase::FlushICache;
+  using AssemblerBase::FlushICacheWithoutIsolate;
+
   // Create an assembler. Instructions and relocation information are emitted
   // into a buffer, with the instructions starting from the beginning and the
   // relocation information starting from the end of the buffer. See CodeDesc