Go patch committed: Fix indirection through circular type

[Ian Lance Taylor]

This patch to the Go frontend fixes the handling of pointer indirection
through a circular type.  The gcc middle-end can not represent a
circular type, as such a construct can not exist in C (in Go you get one
by writing "type T *T").  We handle this by using void* and introducing
a type cast on the indirection.  With the use of the Gcc_backend
interface, we now use a general void* rather than specifically
ptr_type_node which is what we used before.  This patch updates the
handling of pointer indirection to check for this case.  Bootstrapped
and ran Go testsuite on x86_64-unknown-linux-gnu.  Committed to
mainline.

Ian

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