llvm-project

e8335aef - [flang] Avoid crash in name resolution on erroneous type extension (#109312)

[flang] Avoid crash in name resolution on erroneous type extension (#109312) Don't crash when a bad Fortran program tries to extend a derived type with previous legitimate forward references but no prior definition. Fixes https://github.com/llvm/llvm-project/issues/109268.