[gdb/testsuite] Require address update for DW_LNE_end_sequence

With test-case gdb.dwarf2/dw2-epilogue-begin.exp, we have an end_sequence
entry with the same address as the line entry before it:
...
File name                    Line number    Starting address    View    Stmt

dw2-epilogue-begin.c                  44            0x4101e8               x
dw2-epilogue-begin.c                  47            0x4101ec               x
dw2-epilogue-begin.c                   -            0x4101ec
...
and consequently the line entry is removed by gdb:
...
INDEX  LINE   REL-ADDRESS        UNREL-ADDRESS      IS-STMT PRO EPI
0      20     0x00000000004101a8 0x00000000004101a8 Y       Y   Y
1      27     0x00000000004101b0 0x00000000004101b0 Y
2      32     0x00000000004101b8 0x00000000004101b8 Y       Y
3      34     0x00000000004101c0 0x00000000004101c0 Y           Y
4      35     0x00000000004101c8 0x00000000004101c8 Y
5      40     0x00000000004101d4 0x00000000004101d4 Y       Y
6      44     0x00000000004101e8 0x00000000004101e8 Y
7      END    0x00000000004101ec 0x00000000004101ec Y
...

This is a common mistake in dwarf assembly test-cases.

Fix this by:
- requiring an address update for each DW_LNE_end_sequence, and
- fixing the test-cases where that triggers an error.

I also encountered the error in test-case gdb.dwarf2/dw2-bad-elf.exp, and in
this case I worked around it using "DW_LNS_advance_pc 0".

Tested on aarch64-linux.

PR testsuite/31592
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31592

0 files changed, 0 insertions, 0 deletions