[compiler] Ensure feedback vector before compiling.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 5148eb93da847c6203fdbe14b5626bdc0e41b682..fa043995b40cb7426db690aa6c0379374f661568 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -322,10 +322,6 @@ class CompilationInfo {
            output_code_kind() == Code::FUNCTION;
   }
 
-  void EnsureFeedbackVector();
-  Handle<TypeFeedbackVector> feedback_vector() const {
-    return feedback_vector_;
-  }
   void SetCode(Handle<Code> code) { code_ = code; }
 
   void SetBytecodeArray(Handle<BytecodeArray> bytecode_array) {
@@ -534,9 +530,6 @@ class CompilationInfo {
   // The compiled code.
   Handle<Code> code_;
 
-  // Used by codegen, ultimately kept rooted by the SharedFunctionInfo.
-  Handle<TypeFeedbackVector> feedback_vector_;
-
   // Compilation mode flag and whether deoptimization is allowed.
   Mode mode_;
   BailoutId osr_ast_id_;