gh-106360: remove redundant #ifdef (#106622)

Author: iritkatriel

Python/opcode_metadata.h

@@ -1240,7 +1240,7 @@ def write_metadata(self) -> None:
             self.out.emit("extern const struct opcode_metadata _PyOpcode_opcode_metadata[512];")
             self.out.emit("extern const struct opcode_macro_expansion _PyOpcode_macro_expansion[256];")
             self.out.emit("extern const char * const _PyOpcode_uop_name[512];")
-            self.out.emit("#else")
+            self.out.emit("#else // if NEED_OPCODE_METADATA")
 
             self.out.emit("const struct opcode_metadata _PyOpcode_opcode_metadata[512] = {")
 
@@ -1289,12 +1289,10 @@ def write_metadata(self) -> None:
                         case _:
                             typing.assert_never(thing)
 
-            self.out.emit("#ifdef NEED_OPCODE_METADATA")
             with self.out.block("const char * const _PyOpcode_uop_name[512] =", ";"):
                 self.write_uop_items(lambda name, counter: f"[{counter}] = \"{name}\",")
-            self.out.emit("#endif // NEED_OPCODE_METADATA")
 
-            self.out.emit("#endif")
+            self.out.emit("#endif // NEED_OPCODE_METADATA")
 
         with open(self.pymetadata_filename, "w") as f:
             # Create formatter