[lldb/crashlog] Fix python version requirement issue

[mib]

Summary

In 21a597c, we fixed a module loading issue by using the new
argparse.BooleanOptionalAction. However, this is only available
starting python 3.9 and causes test failures on bots that don't fulfill
this requirement.

To address that, this patch replaces the use of BooleanOptionalAction
by a pair of 2 opposite store actions pointing to the same destination
variable.

Signed-off-by: Med Ismail Bennani <[e-mail]>

[bulbazord]

Unfortunate but it makes the most sense for now. Thanks for fixing that.

lldb/examples/python/crashlog.py

):
     arg_parser.add_argument(
         "--debug-delay",
         type=int,
         dest="debug_delay",
         metavar="NSEC",
         help="pause for NSEC seconds for debugger",
         default=0,
     )
+    # NOTE: Requires python 3.9
+    # arg_parser.add_argument(
+    #     "--crashed-only",
+    #     "-c",
+    #     action=argparse.BooleanOptionalAction,
+    #     dest="crashed_only",
+    #     help="only symbolicate the crashed thread",
+    #     default=True,
+    # )
     arg_parser.add_argument(
         "--crashed-only",
         "-c",
-        action=argparse.BooleanOptionalAction,
+        action="store_true",
         dest="crashed_only",
         help="only symbolicate the crashed thread",
         default=True,
     )
     arg_parser.add_argument(
+        "--no-crashed-only",
+        action="store_false",
+        dest="crashed_only",
+        help="do not symbolicate the crashed thread",
+    )
+    arg_parser.add_argument(
         "--disasm-depth",
         "-d",
         type=int,
         dest="disassemble_depth",
         help="set the depth in stack frames that should be disassembled",
         default=1,
     )
     arg_parser.add_argument(