Now that we support outputs from asm goto along indirect edges, we can
remove/revert some code that was added to help warn about the previous
limitation that outputs were not supported along indirect edges.
Reverts some code added in:
commit 72aa619a7fe0 ("Warn of uninitialized variables on asm goto's indirect branch")
commit 3a604fdbcd5f ("[Clang][CFG] check children statements of asm goto")
But keeps+updates the tests.
Link: https://github.com/llvm/llvm-project/issues/53562
Reviewed By: void
Differential Revision: https://reviews.llvm.org/D140508
af6656338d