rewrite_to_chrome_style: Avoid asserts when checking for const-ness.

tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Changes Blink-style names to Chrome-style names. Currently transforms:
 //   fields:
 //     int m_operationCount => int operation_count_
 //   variables (including parameters):
 //     int mySuperVariable => int my_super_variable
 //   constants:
@@ skipping 132 matching lines @@
 
   // http://google.github.io/styleguide/cppguide.html#Constant_Names
   // Static variables that are const-qualified should use kConstantStyle naming.
   if (decl.getStorageDuration() == clang::SD_Static)
     return true;
 
   const clang::Expr* initializer = decl.getInit();
   if (!initializer)
     return false;
 
+  // If the expression is dependent on a template input, then we are not
+  // sure if it can be compile-time generated as calling isEvaluatable() is
+  // not valid on |initializer|.
+  // TODO(crbug.com/581218): We could probably look at each compiled
+  // instantiation of the template and see if they are all compile-time
+  // isEvaluable().
+  if (initializer->isInstantiationDependent())
+    return false;
+
   // If the expression can be evaluated at compile time, then it should have a
   // kFoo style name. Otherwise, not.
   return initializer->isEvaluatable(context);
 }
 
 bool GetNameForDecl(const clang::VarDecl& decl,
                     const clang::ASTContext& context,
                     std::string& name) {
   StringRef original_name = decl.getName();
 
@@ skipping 411 matching lines @@
   for (const auto& r : replacements) {
     std::string replacement_text = r.getReplacementText().str();
     std::replace(replacement_text.begin(), replacement_text.end(), '\n', '\0');
     llvm::outs() << "r:::" << r.getFilePath() << ":::" << r.getOffset()
                  << ":::" << r.getLength() << ":::" << replacement_text << "\n";
   }
   llvm::outs() << "==== END EDITS ====\n";
 
   return 0;
 }