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

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index 490237e7bbdb8224993594ed097c5ae4c76d56d2..8123d5c0038ac635203e35b8430561a34517de31 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -1852,7 +1852,7 @@ void Deoptimizer::EnsureCodeForDeoptimizationEntry(Isolate* isolate,
   }
   CopyBytes(chunk->area_start(), desc.buffer,
             static_cast<size_t>(desc.instr_size));
-  CpuFeatures::FlushICache(chunk->area_start(), desc.instr_size);
+  Assembler::FlushICache(isolate_, chunk->area_start(), desc.instr_size);
 
   data->deopt_entry_code_entries_[type] = entry_count;
 }