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.

1 files changed, 0 insertions, 8 deletions

diff --git a/clang/lib/CodeGen/CGLoopInfo.cpp b/clang/lib/CodeGen/CGLoopInfo.cpp
index c21d4feee7a..6822c6286fe 100644
--- a/clang/lib/CodeGen/CGLoopInfo.cpp
+++ b/clang/lib/CodeGen/CGLoopInfo.cpp
@@ -270,14 +270,6 @@ LoopInfo::createLoopVectorizeMetadata(const LoopAttributes &Attrs,
 
   // Setting vectorize.width
   if (Attrs.VectorizeWidth > 0) {
-    // This implies vectorize.enable = true, but only add it when it is not
-    // already enabled.
-    if (Attrs.VectorizeEnable != LoopAttributes::Enable)
-      Args.push_back(
-          MDNode::get(Ctx, {MDString::get(Ctx, "llvm.loop.vectorize.enable"),
-                            ConstantAsMetadata::get(ConstantInt::get(
-                                llvm::Type::getInt1Ty(Ctx), 1))}));
-
     Metadata *Vals[] = {
         MDString::get(Ctx, "llvm.loop.vectorize.width"),
         ConstantAsMetadata::get(ConstantInt::get(llvm::Type::getInt32Ty(Ctx),