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

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index e3ab7c7e3d30361e4074893025414db87c229767..39db8ebe1c723880508ef2f29afdb97e0f97cf75 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -4755,7 +4755,7 @@ CodePatcher::CodePatcher(byte* address, int size)
 
 CodePatcher::~CodePatcher() {
   // Indicate that code has changed.
-  CpuFeatures::FlushICache(address_, size_);
+  Assembler::FlushICacheWithoutIsolate(address_, size_);
 
   // Check that the code was patched as expected.
   DCHECK(masm_.pc_ == address_ + size_);