Go patch committed: Don't crash on invalid use of multiple results

[Ian Lance Taylor]

There were some cases in the Go frontend where an invalid use of a
function call returning multiple results could cause the compiler to
crash.  For example, it could happen when returning multiple results in
a function which returned an interface type.  This patch avoids the
crashes in invalid programs.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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