[clang-rename] Fix handling of unchanged files
Fix the output of clang-rename for the files without modifications.
Update the code in clang-reorder-fields/tool/ClangReorderFields.cpp
to avoid inconsistency.
Example:
a.h:
struct A {};
a.cpp:
#include "a.h"
int main() { return 0; }
Before the changes the output looks like this:
clang-rename -qualified-name=A -new-name=B a.cpp
<<<<<INVALID SOURCE LOCATION>>>>>
Test plan: make -j8 check-clang-tools
Differential revision: https://reviews.llvm.org/D24634
llvm-svn: 281826