[PATCH] D41733: [Driver] Suggest correctly spelled driver options

[Brian Gesiak via Phabricator via cfe-commits]

modocache created this revision.
modocache added reviewers: yamaguchi, v.g.vassilev, teemperor, ruiu.

Depends on https://reviews.llvm.org/D41732.

Utilities such as `opt`, when invoked with arguments that are very
nearly spelled correctly, suggest the correctly spelled options:

  bin/opt -hel
  opt: Unknown command line argument '-hel'.  Try: 'bin/opt -help'
  opt: Did you mean '-help'?

Clang, on the other hand, prior to this commit, does not:

  bin/clang -hel
  clang-6.0: error: unknown argument: '-hel'

This commit makes use of the new libLLVMOption API from
https://reviews.llvm.org/D41732 in order to provide correct suggestions:

  bin/clang -hel
  clang-6.0: error: unknown argument: '-hel', did you mean '-help'?

Test Plan: `check-clang`


Repository:
  rC Clang

https://reviews.llvm.org/D41733

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Driver/Driver.cpp
  test/Driver/unknown-arg.c
  test/Driver/unsupported-option.c

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