Revert "cpp11-migrate: Write header replacements to disk"

This reverts commit 187204. It broke the freebsd bots:

http://lab.llvm.org:8011/builders/clang-X86_64-freebsd/builds/9561

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@187227 91177308-0d34-0410-b5e6-96231b3b80d8
Added new feature for checking macro and preprocessor conditional consistency.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@187228 91177308-0d34-0410-b5e6-96231b3b80d8