Go patch committed: More uses of backend interface for types

[Ian Lance Taylor]

This patch to the Go frontend and to libgo adds more uses of the backend
interface for types.  There were some changes to libgo because the code
now uses produces a Go type for maps.  Previously the map types were
using size_t, but there is no equivalent to size_t in Go.  Go instead
has uintptr_t, so I changed the libgo code accordingly.  This should not
make any actual difference, of course.  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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