[Isolates] Convert more static data either to read-only or to per-isolate.

src/profile-generator.h

Index: src/profile-generator.h
diff --git a/src/profile-generator.h b/src/profile-generator.h
index 3b67204712088881b5d50121dc1751a01cd9d9da..5e2df7d747d290b9e13aa3d34f455f84ad6b7d1e 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -108,7 +108,7 @@ class CodeEntry {
   uint32_t GetCallUid() const;
   bool IsSameAs(CodeEntry* entry) const;
 
-  static const char* kEmptyNamePrefix;
+  static const char* const kEmptyNamePrefix;
 
  private:
   Logger::LogEventsAndTags tag_;
@@ -411,9 +411,9 @@ class ProfileGenerator {
     return sample_rate_calc_.ticks_per_ms();
   }
 
-  static const char* kAnonymousFunctionName;
-  static const char* kProgramEntryName;
-  static const char* kGarbageCollectorEntryName;
+  static const char* const kAnonymousFunctionName;
+  static const char* const kProgramEntryName;
+  static const char* const kGarbageCollectorEntryName;
 
  private:
   INLINE(CodeEntry* EntryForVMState(StateTag tag));