RFC: [patch] Shark host CPU capabilities autotuner.

[Xerxes Rånby]

Hi!

The attached patch adds a host CPU features autotuner for Shark by using
new API's found in llvm 2.7.

    * ports/hotspot/src/share/vm/shark/sharkCompiler.cpp :
    (SharkCompiler::SharkCompiler): Implement host CPU feature
    autotuner using LLVM 2.7 APIs.
    * ports/hotspot/src/share/vm/shark/llvmHeaders.hpp :
    Define llvm/ADT/StringMap.h and llvm/System/Host.h
    depending on LLVM version.
    Allways define llvm/Support/CommandLine.h.

This patch will become more and more usefull over time when
llvm/System/Host.cpp gets filled with actual host detection code for
various targets.

Cheers
Xerxes


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