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[gdb/testsuite] Fix gdb.base/eh_return.exp
On Fedora rawhide aarch64, I run into: ... (gdb) PASS: gdb.base/eh_return.exp: set breakpoint on address run ^M Starting program: eh_return ^M [Thread debugging using libthread_db enabled]^M Using host libthread_db library "/lib64/libthread_db.so.1".^M [Inferior 1 (process 1113051) exited normally]^M (gdb) FAIL: gdb.base/eh_return.exp: hit breakpoint (the program exited) ... This happens as follows: the test-case sets a breakpoint on the last instruction of function eh2: ... (gdb) break *0x00000000004103ec^M ... and expects to hit the breakpoint, but instead the "br x6" is taken: ... 0x00000000004103e0 <+176>: cbz x4, 0x4103ec <eh2+188>^M 0x00000000004103e4 <+180>: add sp, sp, x5^M 0x00000000004103e8 <+184>: br x6^M 0x00000000004103ec <+188>: ret^M ... In contrast, with fedora f39 we have: ... 0x00000000004103bc <+156>: ldp x2, x3, [sp, #48]^M 0x00000000004103c0 <+160>: ldp x29, x30, [sp, #16]^M 0x00000000004103c4 <+164>: add sp, sp, #0x50^M 0x00000000004103c8 <+168>: add sp, sp, x4^M 0x00000000004103cc <+172>: ret^M ... and the breakpoint is reached. Fix this by detecting that the breakpoint is not hit, and declaring the test unsupported. Tested on aarch64-linux. Approved-By: Tom Tromey <tom@tromey.com> PR testsuite/31291 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31291
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