[PATCH] D21823: [Driver] Add flags for enabling both types of PGO Instrumentation

[Jake VanAdrighem via cfe-commits]

jakev created this revision.
jakev added reviewers: silvas, davidxl, friss, vsk, bob.wilson, xur.
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The flags:
For frontend instrumentation: `-fpgo-train=source-cfg`
For IR-level instrumentation: `-fpgo-train=optimizer-cfg`
When applying profile data: `-fpgo-apply=/path/to/profdata`

This flag format is convenient in the event that we want to extend the feature set we enable/disable on the command line. As an example, something like value-profiling via `-fpgo-train=optimizer-cfg,value-profiling`.

Repository:
  rL LLVM

http://reviews.llvm.org/D21823

Files:
  include/clang/Driver/Options.td
  lib/Driver/ToolChain.cpp
  lib/Driver/Tools.cpp
  test/Driver/clang_f_opts.c

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