[flang] Handle -S assemble only flag in flang-to-external-fc #78979
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Flang was recently updated on Compiler Explorer and by default it's in assemble only mode, you have to enable linking and executing. This means that the default output for flang-to-external-fc is nothing, as it doesn't know what `-S` means. You'd have to know to enable the link to binary option to see any output. Handle `-S` so that users of Compiler Explorer don't have to wonder why the "compiler" is broken.
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Flang was recently updated on Compiler Explorer and by default it's in assemble only mode, you have to enable linking and executing.
This means that the default output for flang-to-external-fc is nothing, as it doesn't know what
-Smeans. You'd have to know to enable the link to binary option to see any output.Handle
-Sso that users of Compiler Explorer don't have to wonder why the "compiler" is broken.