libgo patch committed: Runtime profiling support (not working yet)

[Ian Lance Taylor]

This patch to libgo adds the runtime profiling infrastructure from the
master Go library.  This does not yet work for gccgo, because I haven't
written the code to get a stack traceback.  However, that should come in
time, and adding the infrastructure provides some symbols which code in
the Go library expects to exist.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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