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

src/ppc/assembler-ppc-inl.h

Index: src/ppc/assembler-ppc-inl.h
diff --git a/src/ppc/assembler-ppc-inl.h b/src/ppc/assembler-ppc-inl.h
index 35968fc682a06ec9814a67fc67336572f34b63d1..b1e2825751906820173e64c66f43c54fcbd72ea2 100644
--- a/src/ppc/assembler-ppc-inl.h
+++ b/src/ppc/assembler-ppc-inl.h
@@ -698,7 +698,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     *(p + 3) = instr4;
     *(p + 4) = instr5;
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      CpuFeatures::FlushICache(p, 5 * kInstrSize);
+      Assembler::FlushICacheWithoutIsolate(p, 5 * kInstrSize);
     }
 #else
     uint32_t* p = reinterpret_cast<uint32_t*>(pc);
@@ -713,7 +713,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     *p = instr1;
     *(p + 1) = instr2;
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      CpuFeatures::FlushICache(p, 2 * kInstrSize);
+      Assembler::FlushICacheWithoutIsolate(p, 2 * kInstrSize);
     }
 #endif
     return;