[Bug target/88656] [7/8/9/10 Regression] lr clobbered by thumb prologue before __builtin_return_address(0) reads from it

[gerd at egidy dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88656

--- Comment #4 from gerd at egidy dot de ---
(In reply to Richard Earnshaw from comment #3)
> A regression is not a bug that applies in all previous releases.  A
> regression is where something worked in some previous releases but does not
> work now.

using __builtin_return_address(0) as described in the bug report worked in gcc
5.4.0 and before. To be more specific, it worked before the fix for bug 77933
was incorporated. So to me this is a regression.