Add missing test input for r206979.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@206992 91177308-0d34-0410-b5e6-96231b3b80d8
Prune \param introduced in r206977, possibly committed ahead. [-Wdocumentation]

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@206993 91177308-0d34-0410-b5e6-96231b3b80d8
Add documentation for sample profiling support.

Summary:
This documents the usage of sample profilers with Clang and the
profile format expected by LLVM's optimizers. It also documents the
profile conversion tool used by Linux Perf.

Reviewers: doug.gregor

CC: cfe-commits

Differential Revision: http://reviews.llvm.org/D3402

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git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@206996 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@206997 91177308-0d34-0410-b5e6-96231b3b80d8