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[flang] Improper casting of integer(2) selector for computed gotos #153050

@VijayKandiah

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@VijayKandiah

Reproducer:

program test implicit none integer(2) :: ix ix = 1 goto(10) ix 10 continue print *, 'success' end program test 
$ flang test.f90 flang: llvm-project/llvm/lib/IR/Instructions.cpp:3041: static CastInst *llvm::CastInst::Create(Instruction::CastOps, Value *, Type *, const Twine &, InsertPosition): Assertion `castIsValid(op, S, Ty) && "Invalid cast!"' failed. PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace. 

Changing the selector ix's type to integer(4) works but using type integer(2) does not.

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crashPrefer [crash-on-valid] or [crash-on-invalid]flang:ir

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