Only call .hasResolvedAst in assertions.

[email protected]

Review URL: https://codereview.chromium.org/1949713004 .

Author: johnniwinther

pkg/compiler/lib/src/compiler.dart

@@ -1932,15 +1932,12 @@ class _CompilerResolution implements Resolution {
   ResolvedAst getResolvedAst(ExecutableElement element) {
     assert(invariant(element, element.isDeclaration,
         message: "Element $element must be the declaration."));
-    if (hasResolvedAst(element)) {
-      if (compiler.serialization.isDeserialized(element)) {
-        return compiler.serialization.getResolvedAst(element);
-      }
-      return element.resolvedAst;
-    }
     assert(invariant(element, hasResolvedAst(element),
         message: "ResolvedAst not available for $element."));
-    return null;
+    if (compiler.serialization.isDeserialized(element)) {
+      return compiler.serialization.getResolvedAst(element);
+    }
+    return element.resolvedAst;
   }
 
   @override

pkg/compiler/lib/src/parser/listener.dart

@@ -556,7 +556,7 @@ class Listener {
   }
 
   void reportErrorHelper(Spannable spannable, MessageKind messageKind,
-         [Map arguments = const {}]) {
+      [Map arguments = const {}]) {
     MessageTemplate template = MessageTemplate.TEMPLATES[messageKind];
     String message = template.message(arguments, true).toString();
     Token token;