c7ff137489
During the compiler's order_evaluations() pass, duplicate
call statements were being created and inserted into block
statement lists in situations where there were calls returning
multiple arguments. These duplicates were benign in that they
were ignored during backend code generation, however they
did cause duplicate calls in AST dumps. Tweak the order
evaluation code to handle this case better and avoid inserting
these duplicates.
Fixes golang/go#17237
Reviewed-on: https://go-review.googlesource.com/29857
From-SVN: r240559
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