[Bug testsuite/31202] New: [gdb/testsuite, aarch64] "[PAC]" in backtrace

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31202

            Bug ID: 31202
           Summary: [gdb/testsuite, aarch64] "[PAC]" in backtrace
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On aarch64-linux I'm running into a cluster of fails in these test-cases:
...
#rtf=gdb.base/annota1.exp                                                       
#rtf=gdb.cp/exception.exp                                                       
#rtf=gdb.dwarf2/entry-value-typedef.exp                                         
#rtf=gdb.mi/mi-syn-frame.exp                                                    
#rtf=gdb.mi/mi-catch-cpp-exceptions.exp                                         
#rtf=gdb.threads/pthread_cond_wait.exp                                          
#rtf=gdb.threads/tls.exp 
...

For example, in more detail:
...
gdb) PASS: gdb.cp/exception.exp: continue to first throw
backtrace^M
#0  0x0000fffff7ddcf30 in __cxa_throw () from /lib64/libstdc++.so.6^M
#1  0x0000000000410260 [PAC] in foo (i=20) at
/home/vries/gdb/src/gdb/testsuite/gdb.cp/exception.cc:23^M
#2  0x00000000004102b4 in main () at
/home/vries/gdb/src/gdb/testsuite/gdb.cp/exception.cc:45^M
(gdb) FAIL: gdb.cp/exception.exp: backtrace after first throw
...

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