[gccgo] Turn on garbage collector

[Ian Lance Taylor]

This patch finally turns on the garbage collector for gccgo.  This just
uses the same garbage collector as the other Go compiler; it's a simple
stop-the-world mark-and-sweep collector.  It works but it is far too
slow.  I will be committing some straightforward patches to speed it up
for gccgo, then investigating it in more detail.  Committed to gccgo
branch.

Ian

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