[PATCH] Introduce the InstrProfReader interface and a text reader

[Justin Bogner]

This patch introduces the ProfileData library without going into details
about the data format that instrumentation based profiling should use,
instead just sticking to the naive text format we have now.

This is designed to make readers for multiple formats simple, so that a
"raw" format for compiler-rt to commit and an efficient format for clang
to consume is easy.

Eric, would you mind checking the build system changes? It builds with
both clang and autoconf for me, but I'd appreciate a look over by
someone who has a clue how our build works.

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