Use the container form llvm::sort(C, ...)

There are a few leftovers of rC343147 that are not (\w+)\.begin but in
the form of ([-[:alnum:]>.]+)\.begin or spanning two lines. Change them
to use the container form in this commit. The 12 occurrences have been
inspected manually for safety.

llvm-svn: 343425
diff --git a/clang/utils/TableGen/ClangAttrEmitter.cpp b/clang/utils/TableGen/ClangAttrEmitter.cpp
index 5386ea6..59eab39 100644
--- a/clang/utils/TableGen/ClangAttrEmitter.cpp
+++ b/clang/utils/TableGen/ClangAttrEmitter.cpp
@@ -3961,10 +3961,10 @@
   for (auto &I : SplitDocs) {
     WriteCategoryHeader(I.first, OS);
 
-    llvm::sort(I.second.begin(), I.second.end(),
+    llvm::sort(I.second,
                [](const DocumentationData &D1, const DocumentationData &D2) {
                  return D1.Heading < D2.Heading;
-              });
+               });
 
     // Walk over each of the attributes in the category and write out their
     // documentation.