Fix source locations for inlined and patched functions.

lib/compiler/implementation/scanner/parser.dart

Index: lib/compiler/implementation/scanner/parser.dart
diff --git a/lib/compiler/implementation/scanner/parser.dart b/lib/compiler/implementation/scanner/parser.dart
index a6e09b7e36b3da88d2e3038602495e60ab6c61cf..98bb484f0920a73208110583fd78a74adb61e472 100644
--- a/lib/compiler/implementation/scanner/parser.dart
+++ b/lib/compiler/implementation/scanner/parser.dart
@@ -206,12 +206,7 @@ class Parser {
     return token;
   }
 
-  bool isIdentifier(Token token) {
-    final kind = token.kind;
-    if (kind === IDENTIFIER_TOKEN) return true;
-    if (kind === KEYWORD_TOKEN) return token.value.isPseudo;
-    return false;
-  }
+  bool isIdentifier(Token token) => token.isIdentifier();
 
   Token parseDefaultClauseOpt(Token token) {
     if (isDefaultKeyword(token)) {