Tim Keith 05756e6937 [flang] Add more support for alternate returns ...

Add `hasAlternateReturns` to `evaluate::ProcedureRef`.

Add `HasAlternateReturns` to test subprogram symbols.

Fix `label01.F90` test: It was checking that "error: " didn't appear in
the output. But that was erroneously matching a warning that ends
"would be in error:". So change it to check for ": error: " instead.

Differential Revision: https://reviews.llvm.org/D83007

2020-07-01 17:28:01 -07:00

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