Go patch committed: Implement Go 1.1 terminating statements

[Ian Lance Taylor]

The Go 1.1 release defines what it means for a function to have a
terminating statement, and makes it an error for a function with return
values to not have one.  This patch, from Rémy Oudompheng, implements
that for gccgo.  Bootstrapped and ran testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline and 4.8 branch.

Ian

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