Go patch committed: Fix missing return error for type switches

[Ian Lance Taylor]

The Go frontend gave an incorrect "missing return" error message for a
type switch with a case with multiple types, as in "case T1, T2:".  This
patch fixes that problem.  This patch also changes the "missing return"
error message to use the same text as the gc compiler, and reports it at
the end of the function rather than the start of the function, again to
match the gc compiler.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline and 4.8 branch.

Ian

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