[turbofan] Make FieldAccess::name usable in practice.

src/compiler/access-builder.h

Index: src/compiler/access-builder.h
diff --git a/src/compiler/access-builder.h b/src/compiler/access-builder.h
index 4c24a311c7464489d7a9dba2550a998e560cbd65..2c2ec77d253365d17fdd08522ad12ea46d2d3d46 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -130,6 +130,11 @@ class AccessBuilder final : public AllStatic {
   // Provides access to the marker in a stack frame.
   static FieldAccess ForFrameMarker();
 
+  // ===========================================================================
+
+  // Helper to populate {FieldAccess::name} for tracing.
+  static const char* GetNameForTracing(Handle<Name> name, Zone* zone);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AccessBuilder);
 };