[PATCH] D44970: [XRay][clang] Add flag to choose instrumentation bundles

[Dean Michael Berris via Phabricator via cfe-commits]

dberris created this revision.
dberris added reviewers: echristo, kpw, eizan, pelikan.

This change addresses http://llvm.org/PR36926 by allowing users to pick
which instrumentation bundles to use, when instrumenting with XRay. In
particular, the flag `-fxray-instrumentation-bundle=` has four valid
values:

- `all`: the default, which will emit all kinds of instrumentation

points.

- `none`: equivalent to -fnoxray-instrument
- `function-extents`: only emits the entry/exit sleds
- `custom-only`: only emits the custom event sleds


https://reviews.llvm.org/D44970

Files:
  clang/include/clang/Driver/Options.td
  clang/include/clang/Driver/XRayArgs.h
  clang/include/clang/Frontend/CodeGenOptions.def
  clang/include/clang/Frontend/CodeGenOptions.h
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/lib/Driver/XRayArgs.cpp
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/test/CodeGen/xray-instrumentation-bundles.cpp

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