[compiler] Remove CompilationInfo::unoptimized_code field.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 9d612348a08200f1cb7f9f66f0331cb8628c4d9e..5148eb93da847c6203fdbe14b5626bdc0e41b682 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_; }
-  Handle<Code> unoptimized_code() const { return unoptimized_code_; }
   int opt_count() const { return opt_count_; }
   int num_parameters() const;
   int num_parameters_including_this() const;
@@ -362,10 +361,9 @@ class CompilationInfo {
     code_flags_ =
         Code::KindField::update(code_flags_, Code::OPTIMIZED_FUNCTION);
   }
-  void SetOptimizingForOsr(BailoutId osr_ast_id, Handle<Code> unoptimized) {
+  void SetOptimizingForOsr(BailoutId osr_ast_id) {
     SetOptimizing();
     osr_ast_id_ = osr_ast_id;
-    unoptimized_code_ = unoptimized;
   }
 
   // Deoptimization support.
@@ -389,7 +387,7 @@ class CompilationInfo {
   }
 
   void ReopenHandlesInNewHandleScope() {
-    unoptimized_code_ = Handle<Code>(*unoptimized_code_);
+    // Empty for now but will be needed once fields move from ParseInfo.
   }
 
   void AbortOptimization(BailoutReason reason) {
@@ -542,10 +540,6 @@ class CompilationInfo {
   // Compilation mode flag and whether deoptimization is allowed.
   Mode mode_;
   BailoutId osr_ast_id_;
-  // The unoptimized code we patched for OSR may not be the shared code
-  // afterwards, since we may need to compile it again to include deoptimization
-  // data.  Keep track which code we patched.
-  Handle<Code> unoptimized_code_;
 
   // Holds the bytecode array generated by the interpreter.
   // TODO(rmcilroy/mstarzinger): Temporary work-around until compiler.cc is