[Bug ipa/78535] [6.2] invalid code generation with -O1 -fdevirtualize

[daniel.f.starke at freenet dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78535

--- Comment #1 from Daniel Starke <daniel.f.starke at freenet dot de> ---
Comparing the outputs created with -fdump-tree-all enabled for both tested
command-line combinations hints that -flto -fdevirtualize fails when one of the
following passes is enabled via -O1:
- nothrow
- early_optimizations
- objsz1
- ccp1
- forwprop1
- esra
- ealias
- fre1
- mergephi1
- dse1
- cddce1
- local-pure-const1