SuccessChanges

Summary

  1. Revert "Recommit "[Clang] Pragma vectorize_width() implies (details)
Commit 6d424a161bf3e52730371da0b9439ed93a8ce406 by rupprecht
Revert "Recommit "[Clang] Pragma vectorize_width() implies
vectorize(enable)""
This reverts commit 80371c74ae63d2f260bcc75408be9c6f81e38465.
Given the following source:
``` void a() {
for (;;)
   ;
}
```
It incorrectly enables vectorization (with vector width 1), as well as
generating a warning that vectorization could not be performed.
The file was modifiedclang/lib/CodeGen/CGLoopInfo.cpp
The file was modifiedclang/test/CodeGenCXX/pragma-loop.cpp
The file was modifiedclang/test/CodeGenCXX/pragma-loop-predicate.cpp