Go patch committed: Check for nil pointers when taking address

[Ian Lance Taylor]

In Go 1.2 the language was changed slightly to prohibit taking the
address of a field in a struct given a nil pointer to the struct
(http://golang.org/s/go12nil).  This patch by Chris Manghane implements
that check in gccgo.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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