[heap] Remove dead counters and move regexp code counter to Isolate

src/regexp/jsregexp.cc

Index: src/regexp/jsregexp.cc
diff --git a/src/regexp/jsregexp.cc b/src/regexp/jsregexp.cc
index 8b21459059aa76a47dd9cfe3ca369a9d317be6cb..0ed3086ce674833ef973528d6943fc9f65451c10 100644
--- a/src/regexp/jsregexp.cc
+++ b/src/regexp/jsregexp.cc
@@ -1106,12 +1106,11 @@ RegExpEngine::CompilationResult RegExpCompiler::Assemble(
     RegExpNode* start,
     int capture_count,
     Handle<String> pattern) {
-  Heap* heap = pattern->GetHeap();
+  Isolate* isolate = pattern->GetHeap()->isolate();
 
 #ifdef DEBUG
   if (FLAG_trace_regexp_assembler)
-    macro_assembler_ =
-        new RegExpMacroAssemblerTracer(isolate(), macro_assembler);
+    macro_assembler_ = new RegExpMacroAssemblerTracer(isolate, macro_assembler);
   else
 #endif
     macro_assembler_ = macro_assembler;
@@ -1135,11 +1134,11 @@ RegExpEngine::CompilationResult RegExpCompiler::Assemble(
   }
 
   Handle<HeapObject> code = macro_assembler_->GetCode(pattern);
-  heap->IncreaseTotalRegexpCodeGenerated(code->Size());
+  isolate->IncreaseTotalRegexpCodeGenerated(code->Size());
   work_list_ = NULL;
 #ifdef ENABLE_DISASSEMBLER
   if (FLAG_print_code) {
-    CodeTracer::Scope trace_scope(heap->isolate()->GetCodeTracer());
+    CodeTracer::Scope trace_scope(isolate->GetCodeTracer());
     OFStream os(trace_scope.file());
     Handle<Code>::cast(code)->Disassemble(pattern->ToCString().get(), os);
   }
@@ -6761,8 +6760,9 @@ RegExpEngine::CompilationResult RegExpEngine::Compile(
 bool RegExpEngine::TooMuchRegExpCode(Handle<String> pattern) {
   Heap* heap = pattern->GetHeap();
   bool too_much = pattern->length() > RegExpImpl::kRegExpTooLargeToOptimize;
-  if (heap->total_regexp_code_generated() > RegExpImpl::kRegExpCompiledLimit &&
-      heap->memory_allocator()->SizeExecutable() >
+  if (heap->isolate()->total_regexp_code_generated() >
+          RegExpImpl::kRegExpCompiledLimit &&
+      heap->CommittedMemoryExecutable() >
           RegExpImpl::kRegExpExecutableMemoryLimit) {
     too_much = true;
   }