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

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index af9d261b9e969e91c3c6608cc4cc27ef25adfd0a..d7697f0623eb91951cad3807f3a8bb9a6d455b9a 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -4380,7 +4380,7 @@ CodePatcher::CodePatcher(byte* address, int instructions,
 CodePatcher::~CodePatcher() {
   // Indicate that code has changed.
   if (flush_cache_ == FLUSH) {
-    CpuFeatures::FlushICache(address_, size_);
+    Assembler::FlushICacheWithoutIsolate(address_, size_);
   }
 
   // Check that the code was patched as expected.