compiler: Issue channel type errors earlier.

    
    When asking for the type of a receive operation, the compiler would
    return an error type if the receive operator was being used on an
    invalid channel type and the error would be reported in a later pass.
    There are several ways that the type checking pass would not see
    the original node and fail to issue the error.  This patch modifies
    receive operations to give an error immediately once it is known that
    the channel type is invalid.
    
    Fixes golang/go#12323.
    
    Reviewed-on: https://go-review.googlesource.com/13987


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227863 138bc75d-0d04-0410-961f-82ee72b054a4

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