PSA: Added lldb module to manage diagnostic breakpoints

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PSA: Added lldb module to manage diagnostic breakpoints

Alex Denisov via cfe-dev
This module was committed in r316773, and allows developers to manage a variety of diagnostic breakpoints.

Feedback on syntax, usability, and missing features is welcome.

(lldb) help clangdiag
     For more information run 'help clangdiag'  Expects 'raw' input (see 'help raw-input'.)

     Commands for managing clang diagnostic breakpoints

Syntax: clangdiag enable [<warning>|<diag-name>]
        clangdiag disable
        clangdiag diagtool [<path>|reset]

The following subcommands are supported:

      enable   -- Enable clang diagnostic breakpoints.
      disable  -- Disable all clang diagnostic breakpoints.
      diagtool -- Return, set, or reset diagtool path.

This command sets breakpoints in clang, and clang based tools, that
emit diagnostics.  When a diagnostic is emitted, and clangdiag is
enabled, it will use the appropriate diagtool application to determine
the name of the DiagID, and set breakpoints in all locations that
'diag::name' appears in the source.  Since the new breakpoints are set
after they are encountered, users will need to launch the executable a
second time in order to hit the new breakpoints.

For in-tree builds, the diagtool application, used to map DiagID's to
names, is found automatically in the same directory as the target
executable.  However, out-or-tree builds must use the 'diagtool'
subcommand to set the appropriate path for diagtool in the clang debug
bin directory.  Since this mapping is created at build-time, it's
important for users to use the same version that was generated when
clang was compiled, or else the id's won't match.

- Substrings can be passed for both <warning> and <diag-name>.
- If <warning> is passed, only enable the DiagID(s) for that warning.
- If <diag-name> is passed, only enable that DiagID.
- Rerunning enable clears existing breakpoints.
- diagtool is used in breakpoint callbacks, so it can be changed
  without the need to rerun enable.
- Adding this to your ~.lldbinit file makes clangdiag available at startup:
  "command script import /path/to/


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