Rollup merge of #137967 - mustartt:fix-aix-test-hangs, r=workingjubilee

[AIX] Fix hangs during testing

Fixes all current test hangs experienced during CI runs.
1. ipv6 link-local (the loopback device) gets assigned an automatic zone id of 1, causing the assert to fail and hang in `library/std/src/net/udp/tests.rs`
2. Const alloc does not fail gracefully
3. Debuginfo test has problem with gdb auto load safe path

Author: Kobzol