Fix typos of "function".

pkg/compiler/lib/src/ssa/builder.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 class SsaFunctionCompiler implements FunctionCompiler {
   SsaCodeGeneratorTask generator;
   SsaBuilderTask builder;
   SsaOptimizerTask optimizer;
@@ skipping 5163 matching lines @@
   }
 
   @override
   void visitUnresolvedInvoke(
       ast.Send node,
       Element element,
       ast.NodeList arguments,
       Selector selector,
       _) {
     if (element is ErroneousElement) {
-      // An erroneous element indicates that the funciton could not be
+      // An erroneous element indicates that the function could not be
       // resolved (a warning has been issued).
       handleInvalidStaticInvoke(node, element);
     } else {
       // TODO(ahe): Do something like [generateWrongArgumentCountError].
       stack.add(graph.addConstantNull(compiler));
     }
     return;
   }
 
   HConstant addConstantString(String string) {
@@ skipping 2914 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.findHelper('DynamicRuntimeType');
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }