Go patch committed: Check for value method on dereferenced value

[Ian Lance Taylor]

In Go pointers are automatically dereferenced when calling value
methods.  However, the Go frontend was accidentally permitting a double
dereference when calling a method on a pointer value, which the language
does not permit.  This patch fixes the problem.  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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