feat(Compiler): DirectiveNormalizer => AstDirectiveNormalizer.

This switches the directive/template normalization process (part of the processing before passing metadata to the view compiler) to use the package:angular_ast-based template parser instead of the old one. This should resolve errors like:

"NoSuchMethod: =endSourceSpan"

... which were due to bad recovery in the old parser.

PiperOrigin-RevId: 190860110

angular/CHANGELOG.md

@@ -66,6 +66,12 @@
     `\u{?-??????}`. This enables support for Unicode supplementary planes, which
     includes emojis!
 
+### Internal cleanup
+
+*   Template normalization in the compiler now uses the newer template parser
+    based on `package:angular_ast`. There is no flag to enable the old behavior
+    but please reach out if you see issues in this release.
+
 ## 5.0.0-alpha+8
 
 ### New features

angular_compiler/lib/src/cli/flags.dart

@@ -91,7 +91,7 @@ class CompilerFlags {
     this.ignoreNgPlaceholderForGoldens: false,
     this.profileFor: Profile.none,
     this.useFastBoot: true,
-    this.useNewTemplateNormalizer: false,
+    this.useNewTemplateNormalizer: true,
     this.useLegacyStyleEncapsulation: false,
     this.useNewPreserveWhitespace: false,
   });