[flang-commits] [flang] [flang] add simplification for ProductOp intrinsic (PR #169575)

[Eugene Epshteyn via flang-commits]

eugeneepshteyn wrote:

There are definitely regressions, for example in https://github.com/fujitsu/compiler-test-suite/blob/main/Fortran/0133/0133_0038.f  I compiled that test at `-O2`. The output of this test should be "OK PASS", nothing else.

@stomfaig , please check that the product implementation is functionally correct.

https://github.com/llvm/llvm-project/pull/169575