[PATCH] update error reporting for OpenACC wait (PR85702)

[Cesar Philippidis]

Prior to this patch, when the Fortran FE detected an invalid argument to
the OpenACC wait directive, it was trying to read the location of the
expression after it checked does not exist to error diagnostics. This
patch resolves that issue by reporting the error using %C.

I'll commit this patch to trunk as obvious.

Cesar
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