[PERF] Removes the Errors created for autotracking transactions

These errors are expensive to generate, and have become problematic for
development mode in general. The plan is to remove them for now, and try
to bring them back some time in the future in a opt-in way that is more
conventional and comprehensive (e.g. show all possible consumption
locations, not just the first one).

packages/@glimmer/validator/lib/debug.ts

@@ -3,7 +3,6 @@ import { DEBUG } from '@glimmer/env';
 
 interface AutotrackingTransactionSourceData {
   context?: string;
-  error: Error;
 }
 
 export let runInAutotrackingTransaction:
@@ -22,7 +21,7 @@ export let assertTagNotConsumed:
   | undefined
   | (<T>(tag: Tag, obj?: T, keyName?: keyof T | string | symbol, forceHardError?: boolean) => void);
 
-export let markTagAsConsumed: undefined | ((_tag: Tag, sourceError: Error) => void);
+export let markTagAsConsumed: undefined | ((_tag: Tag) => void);
 
 if (DEBUG) {
   let DEPRECATE_IN_AUTOTRACKING_TRANSACTION = false;
@@ -145,25 +144,16 @@ if (DEBUG) {
       message.push(`\`${String(keyName)}\` was first used:\n\n${sourceData.context}`);
     }
 
-    if (sourceData.error.stack) {
-      let sourceStack = sourceData.error.stack;
-      let thirdIndex = nthIndex(sourceStack, '\n', 3);
-      sourceStack = sourceStack.substr(thirdIndex);
-
-      message.push(`Stack trace for the first usage: ${sourceStack}`);
-    }
-
     message.push(`Stack trace for the update:`);
 
     return message.join('\n\n');
   };
 
-  markTagAsConsumed = (_tag: Tag, sourceError: Error) => {
+  markTagAsConsumed = (_tag: Tag) => {
     if (!AUTOTRACKING_TRANSACTION || AUTOTRACKING_TRANSACTION.has(_tag)) return;
 
     AUTOTRACKING_TRANSACTION.set(_tag, {
       context: debuggingContexts!.map(c => c.replace(/^/gm, '  ').replace(/^ /, '-')).join('\n\n'),
-      error: sourceError,
     });
 
     // We need to mark the tag and all of its subtags as consumed, so we need to
@@ -172,11 +162,11 @@ if (DEBUG) {
     let tag = _tag as any;
 
     if (tag.subtag) {
-      markTagAsConsumed!(tag.subtag, sourceError);
+      markTagAsConsumed!(tag.subtag);
     }
 
     if (tag.subtags) {
-      tag.subtags.forEach((tag: Tag) => markTagAsConsumed!(tag, sourceError));
+      tag.subtags.forEach((tag: Tag) => markTagAsConsumed!(tag));
     }
   };
 

packages/@glimmer/validator/lib/tracking.ts

@@ -31,7 +31,7 @@ class Tracker {
     this.tags.add(tag);
 
     if (DEBUG) {
-      markTagAsConsumed!(tag, new Error());
+      markTagAsConsumed!(tag);
     }
 
     this.last = tag;