[modularize] Fix the build

This patch fixes:

  clang-tools-extra/modularize/ModularizeUtilities.cpp:293:15: error:
  no member named 'parseModuleMapFile' in 'clang::ModuleMap'; did you
  mean 'loadModuleMapFile'?

Author: kazutakahirata

clang-tools-extra/modularize/ModularizeUtilities.cpp

@@ -290,7 +290,7 @@ std::error_code ModularizeUtilities::loadModuleMap(
     Target.get(), *HeaderInfo));
 
   // Parse module.modulemap file into module map.
-  if (ModMap->parseModuleMapFile(ModuleMapEntry, false, Dir)) {
+  if (ModMap->loadModuleMapFile(ModuleMapEntry, false, Dir)) {
     return std::error_code(1, std::generic_category());
   }