llvm::sort(C.begin(), C.end(), ...) -> llvm::sort(C, ...)

llvm::sort(C.begin(), C.end(), ...) -> llvm::sort(C, ...)

Summary: The convenience wrapper in STLExtras is available since rL342102.

Reviewers: rsmith, #clang, dblaikie

Reviewed By: rsmith, #clang

Subscribers: mgrang, arphaman, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D52576

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@343147 91177308-0d34-0410-b5e6-96231b3b80d8