[all-commits] [llvm/llvm-project] d6a360: [flang] legacy branch target (#75628)

[vdonaldson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d6a3607ff5ebae6575a713cdf12f1a2dda7cc72f
      https://github.com/llvm/llvm-project/commit/d6a3607ff5ebae6575a713cdf12f1a2dda7cc72f
  Author: vdonaldson <37090318+vdonaldson at users.noreply.github.com>
  Date:   2023-12-15 (Fri, 15 Dec 2023)

  Changed paths:
    M flang/lib/Lower/PFTBuilder.cpp

  Log Message:
  -----------
  [flang] legacy branch target (#75628)

Branching to an endif statement from outside of the if is nonconformant:

  subroutine jump(n)
    goto 6
    if (n == 3) then
      goto 7
  6 end if
    print *, 'pass'
    return
  7 print *, 'fail'
  end

However, this branch was permitted up to f90. Account for this usage
when rewriting if constructs and if statements by suppressing rewriting
if the end statement is labeled.