[compiler] Remove CompilationInfo::opt_count field.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index fa043995b40cb7426db690aa6c0379374f661568..90b1cc4b30438fcc20cbf11d05a6e6148b050519 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -197,7 +197,6 @@ class CompilationInfo {
   Handle<Code> code() const { return code_; }
   Code::Flags code_flags() const { return code_flags_; }
   BailoutId osr_ast_id() const { return osr_ast_id_; }
-  int opt_count() const { return opt_count_; }
   int num_parameters() const;
   int num_parameters_including_this() const;
   bool is_this_defined() const;
@@ -557,10 +556,6 @@ class CompilationInfo {
 
   InlinedFunctionList inlined_functions_;
 
-  // A copy of shared_info()->opt_count() to avoid handle deref
-  // during graph optimization.
-  int opt_count_;
-
   // Number of parameters used for compilation of stubs that require arguments.
   int parameter_count_;