Prefer more specific functions to DtoResolveDsymbol.

The remaining ones should also be easy to remove with a
closer look at the situation.

Ideally, we would get rid of all of them at some point and
use safe wrapper functions for accessing the IrDsymbol
associated with a given declaration (which would emit the
declarations on the fly if not already present).

gen/functions.cpp

@@ -1178,7 +1178,7 @@ llvm::FunctionType* DtoBaseFunctionType(FuncDeclaration* fdecl)
             break;
     }
 
-    DtoResolveDsymbol(f);
+    DtoResolveFunction(f);
     return llvm::cast<llvm::FunctionType>(DtoType(f->type));
 }