Use CHECK instead of assert

Author: kparzysz

flang/lib/Semantics/resolve-directives.cpp

@@ -2517,8 +2517,7 @@ void OmpAttributeVisitor::ResolveOmpObject(
                 if (ompFlag == Symbol::Flag::OmpDeclareTarget) {
                   if (symbol->IsFuncResult()) {
                     if (Symbol * func{currScope().symbol()}) {
-                      assert(
-                          func->IsSubprogram() && "Expecting function scope");
+                      CHECK(func->IsSubprogram());
                       func->set(ompFlag);
                       name->symbol = func;
                     }