Go patch committed: Add cgo support routines

[Ian Lance Taylor]

This patch to libgo adds cgo support routines like the ones I recently
added to the gc compiler.  These routines are used by code generated by
the development version of SWIG (as of this morning).  There is one
routine to allocate memory controlled by the Go garbage collector, and
one routine to invoke the Go builtin function panic.  Bootstrapped and
ran Go testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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