[lldb/crashlog] Fix frame parser regex for when there is no source info

It can happen that the originator of a crash report doesn't have access
to certain images. When that's the case, ReportCrash won't show the
source info in the crash report stack frames, but only the stack address
and image name.

This patch fixes a bug in the crashlog stackframe parser regular
expression to optionally match the source info group.

rdar://101934135

Differential Revision: https://reviews.llvm.org/D137466

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

lldb/examples/python/crashlog.py

@@ -645,7 +645,7 @@ class TextCrashLogParser(CrashLogParser):
                              r'(.+?)\s+'               # img_name
                              r'(?:' +version+ r'\s+)?' # img_version
                              r'(0x[0-9a-fA-F]{4,})'    # addr (4 chars or more)
-                             r' +(.*)'                 # offs
+                             r'(?: +(.*))?'            # offs
                             )
     null_frame_regex = re.compile(r'^\d+\s+\?\?\?\s+0{4,} +')
     image_regex_uuid = re.compile(r'(0x[0-9a-fA-F]+)'          # img_lo

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/Inputs/a.out.crash

@@ -29,7 +29,7 @@ Terminating Process:   exc handler [21606]
 
 Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
 0   a.out                         	@foo@ foo + 16 (test.c:3)
-1   a.out                         	@bar@ bar + 9 (test.c:6)
+1   a.out                         	@bar@
 2   a.out                         	@main@ main + 20 (test.c:8)
 3   libdyld.dylib                 	0x1000000 start + 1