llvm dev - Apr 2019 - Adding pass options to categories to simplify opt -help output

I find opt -help output to be a little hard to grok, and have to look at
the actually cpp file to figure out which options are valid for a
particular pass.

So, I'd like to add them to pass specific cl::OptionCategory's to
simplify
the output.  Something like this -- just picked -function-import as an
example:

function-import options:

  -compute-dead                                                  - Compute
dead symbols
  -enable-import-metadata                                        - Enable
import metadata like 'thinlto_src_module'
  -import-all-index                                              - Import
all external functions in index.
  -import-cold-multiplier=<N>                                    -
Multiply
the `import-instr-limit` threshold for cold callsites
  -import-critical-multiplier=<x>                                -
Multiply
the `import-instr-limit` threshold for critical callsites
  -import-cutoff=<N>                                             - Only
import first N functions if N>=0 (default -1)
  -import-hot-evolution-factor=<x>                               - As we
import functions called from hot callsite, multiply the
`import-instr-limit` threshold by this factor before processing newly
imported
functions
  -import-hot-multiplier=<x>                                     -
Multiply
the `import-instr-limit` threshold for hot callsites
  -import-instr-evolution-factor=<x>                             - As we
import functions, multiply the `import-instr-limit` threshold by this
factor before processing newly imported functions
  -import-instr-limit=<N>                                        - Only
import functions with less than N instructions
  -print-import-failures                                         - Print
information for functions rejected for importing
  -print-imports                                                 - Print
imported functions
  -summary-file=<string>                                         - The
summary file to use for function importing.

If there are no objections, I'll create a patch.

thanks...
don
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