i#5437 glibc2.34: Workaround for SIGFPE

[derekbruening]

Adds a workaround for the SIGFPE in glibc 2.34+ __libc_early_init() by setting two ld.so globals located via hardcoded offsets, making this fragile and considered temporary.

Tested on glibc 2.34 where every libc-using client crashes with SIGFPE but they work with this fix.

Adds an Ubuntu22 GA CI run but if we have failures due to other reasons the plan is to drastically shrink the tests run or abandon if it's too much work right now.

Issue: #5437

[derekbruening]

The hardcoded offsets here will break on the next glibc update which inserts a var earlier in that globals list -- and I don't know enough about it to know how often that happens, whether vars are always appended, or what.

One option is to decode __libc_early_init and look for offsets there: but we'd look for hardcoded code patterns and that is also fragile. Maybe there is some simpler exported function to decode.

We could make runtime options for the offsets so a user could work around this.

2.34 seems to work if we don't even call __libc_early_init (but 2.32 crashes if we don't): we could avoid the call for 2.34, maybe if a decode of the func doesn't match our expected pattern.

OTOH not sure it's worth a ton of work if we think it's better to put that time into a refactor private loading process.

[derekbruening]

I'm also looking for reviewer input on what to do with the ubuntu22 test I added here. We have the following failures (but many passes indicating this fix is working there else nearly every client test would fail):

	code_api|common.fib 
	code_api|common.nativeexec 
	code_api|common.nativeexec_retakeover 
	(ignore: i#2941) 	code_api|common.nativeexec_exe 
	(ignore: i#2941) 	code_api|common.nativeexec_retakeover_opt 
	(ignore: i#2941) 	code_api|common.nativeexec_bindnow 
	code_api|common.nativeexec_exe_opt 
	(ignore: i#2941) 	code_api|common.nativeexec_bindnow_opt 
	code_api|security-common.codemod 
	code_api|security-common.decode-bad-stack_FLAKY 
	code_api|security-common.selfmod2 
	code_api|security-common.selfmod-big 
	code_api|security-common.selfmod 
	code_api|security-common.TestAllocWE 
	code_api|security-common.TestMemProtChg_FLAKY 
	code_api|tool.drcachesim.phys_SUDO 
	code_api|tool.drcachesim.phys-threads_SUDO 
	code_api|tool.drcachesim.delay-global 
	code_api|tool.drcachesim.threads 
	code_api|tool.drcachesim.threads-with-config-file 
	code_api|tool.drcachesim.coherence 
	code_api,satisfy_w_xor_x|security-common.selfmod2 

Actually, some if not all of those are the rseq bug #5431.

[derekbruening]

Actually that list is release build: many more failed on debug; but again they are mostly the rseq #5431.