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[flang] Don't prematurely resolve subprogram names
Name resolution for subprograms checks whether the name is already present in the enclosing scope as a generic interface, so that the case of a generic with the same name as one of its specifics can be handled. The particular means by which the enclosing scope is searched for the name would resolve the name (bind a symbol to it) as a side effect. This turns out to be the wrong thing to do when the subprogram is going to have its symbol created in another scope to cope with its BIND(C,NAME="name") name, and its Fortran name is already present in the enclosing scope for a subprogram of the same name but without BIND(C,NAME="name"). A very long explanation for a one-line fix, sorry. In short, change the code to look up the name but not resolve it at that point. Differential Revision: https://reviews.llvm.org/D126149
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