refactor(core): move attachDebugGetter to i18n specifc code (#48549)

The attachDebugGetter function is only used in the i18n specific code
so could be moved closer to the sole usage site instead of being
exported to the entire framework code. It also lets us remove the
entire packages/core/src/render3/util/debug_utils.ts file.

PR Close #48549

packages/core/src/render3/i18n/i18n_parse.ts

@@ -22,7 +22,6 @@ import {TNode, TNodeType} from '../interfaces/node';
 import {SanitizerFn} from '../interfaces/sanitization';
 import {HEADER_OFFSET, LView, TView} from '../interfaces/view';
 import {getCurrentParentTNode, getCurrentTNode, setCurrentTNode} from '../state';
-import {attachDebugGetter} from '../util/debug_utils';
 
 import {i18nCreateOpCodesToString, i18nRemoveOpCodesToString, i18nUpdateOpCodesToString, icuCreateOpCodesToString} from './i18n_debug';
 import {addTNodeAndUpdateInsertBeforeIndex} from './i18n_insert_before_index';
@@ -52,6 +51,23 @@ function replaceNgsp(value: string): string {
   return value.replace(NGSP_UNICODE_REGEXP, ' ');
 }
 
+/**
+ * Patch a `debug` property getter on top of the existing object.
+ *
+ * NOTE: always call this method with `ngDevMode && attachDebugObject(...)`
+ *
+ * @param obj Object to patch
+ * @param debugGetter Getter returning a value to patch
+ */
+function attachDebugGetter<T>(obj: T, debugGetter: (this: T) => any): void {
+  if (ngDevMode) {
+    Object.defineProperty(obj, 'debug', {get: debugGetter, enumerable: false});
+  } else {
+    throw new Error(
+        'This method should be guarded with `ngDevMode` so that it can be tree shaken in production!');
+  }
+}
+
 /**
  * Create dynamic nodes from i18n translation block.
  *