Avoid flushing the icache unnecessarily when updating target addresses in code.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index b7928af19361db20e754f564a6dfe7f02c1dc49f..cdf6bef9df10503738b7b4957291c229853ec796 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10969,7 +10969,7 @@ void Code::InvalidateEmbeddedObjects() {
 
 void Code::Relocate(intptr_t delta) {
   for (RelocIterator it(this, RelocInfo::kApplyMask); !it.done(); it.next()) {
-    it.rinfo()->apply(delta);
+    it.rinfo()->apply(delta, SKIP_ICACHE_FLUSH);
   }
   CPU::FlushICache(instruction_start(), instruction_size());
 }
@@ -11001,26 +11001,28 @@ void Code::CopyFrom(const CodeDesc& desc) {
     RelocInfo::Mode mode = it.rinfo()->rmode();
     if (mode == RelocInfo::EMBEDDED_OBJECT) {
       Handle<Object> p = it.rinfo()->target_object_handle(origin);
-      it.rinfo()->set_target_object(*p, SKIP_WRITE_BARRIER);
+      it.rinfo()->set_target_object(*p, SKIP_WRITE_BARRIER, SKIP_ICACHE_FLUSH);
     } else if (mode == RelocInfo::CELL) {
       Handle<Cell> cell  = it.rinfo()->target_cell_handle();
-      it.rinfo()->set_target_cell(*cell, SKIP_WRITE_BARRIER);
+      it.rinfo()->set_target_cell(*cell, SKIP_WRITE_BARRIER, SKIP_ICACHE_FLUSH);
     } else if (RelocInfo::IsCodeTarget(mode)) {
       // rewrite code handles in inline cache targets to direct
       // pointers to the first instruction in the code object
       Handle<Object> p = it.rinfo()->target_object_handle(origin);
       Code* code = Code::cast(*p);
       it.rinfo()->set_target_address(code->instruction_start(),
-                                     SKIP_WRITE_BARRIER);
+                                     SKIP_WRITE_BARRIER,
+                                     SKIP_ICACHE_FLUSH);
     } else if (RelocInfo::IsRuntimeEntry(mode)) {
       Address p = it.rinfo()->target_runtime_entry(origin);
-      it.rinfo()->set_target_runtime_entry(p, SKIP_WRITE_BARRIER);
+      it.rinfo()->set_target_runtime_entry(p, SKIP_WRITE_BARRIER,
+                                           SKIP_ICACHE_FLUSH);
     } else if (mode == RelocInfo::CODE_AGE_SEQUENCE) {
       Handle<Object> p = it.rinfo()->code_age_stub_handle(origin);
       Code* code = Code::cast(*p);
-      it.rinfo()->set_code_age_stub(code);
+      it.rinfo()->set_code_age_stub(code, SKIP_ICACHE_FLUSH);
     } else {
-      it.rinfo()->apply(delta);
+      it.rinfo()->apply(delta, SKIP_ICACHE_FLUSH);
     }
   }
   CPU::FlushICache(instruction_start(), instruction_size());