Revert "Modules: Make missing headers in a module.map a warning not an error."

This was committed accidentally.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@197389 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: Keep trailing annotations together.

Before:
  virtual void aaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaa aaaa, aaaaaaaaaaa aaaaa) const
      override;
  virtual void aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa() const
      override;

After:
  virtual void aaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaa aaaa,
                     aaaaaaaaaaa aaaaa) const override;
  virtual void aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa()
      const override;

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@197391 91177308-0d34-0410-b5e6-96231b3b80d8