Remove unused CodeAndVector struct

I could not find any usage of this struct and it is in the internal
namespace so I though it might be safe to remove it.

Bug: 
Change-Id: I85d605712ab1ab3218eb03ed4d3b5fc0e541e21a
Reviewed-on: https://chromium-review.googlesource.com/641270Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47813}

src/objects/shared-function-info.h

@@ -526,13 +526,6 @@ class SharedFunctionInfo : public HeapObject {
   DISALLOW_IMPLICIT_CONSTRUCTORS(SharedFunctionInfo);
 };
 
-// Result of searching in an optimized code map of a SharedFunctionInfo. Note
-// that both {code} and {vector} can be NULL to pass search result status.
-struct CodeAndVector {
-  Code* code;              // Cached optimized code.
-  FeedbackVector* vector;  // Cached feedback vector.
-};
-
 // Printing support.
 struct SourceCodeOf {
   explicit SourceCodeOf(SharedFunctionInfo* v, int max = -1)