Go patch committed: Avoid crash, fix *&x when x is not addressable

[Ian Lance Taylor]

This patch to the Go frontend avoids a compiler crash on invalid code.
It also fixes the case of *&x when x is not addressable--the expression
was being converted to x without checking, meaning that the compiler
would accept invalid code.  Finally, an error message is fixed to have
correct punctuation.  This is all from PR 60288.  Bootstrapped and ran
Go testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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