[zorg][lldb-statistics] Use summary statistics dump

Otherwise the generated data is too large to send to LNT.

We were getting following errors:
```
File
"/Applications/Xcode-beta.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/http/client.py",
line 285, in _read_status
    raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without
response
```

zorg/jenkins/jobs/util/run_lldb_metrics.sh

@@ -41,7 +41,7 @@ profile_clang() {
     local stats_filename="${RESULTS_DIR}/${test_case_name}.json"
 
     # Run test-case and collect statistics.
-    eval "${profile_invocation} -o 'script -- f=open(\"${stats_filename}\",\"w\"); lldb.debugger.SetOutputFileHandle(f,True); lldb.debugger.HandleCommand(\"statistics dump\")' --batch -- ${debuggee_invocation}"
+    eval "${profile_invocation} -o 'script -- f=open(\"${stats_filename}\",\"w\"); lldb.debugger.SetOutputFileHandle(f,True); lldb.debugger.HandleCommand(\"statistics dump --summary\")' --batch -- ${debuggee_invocation}"
 
     [[ -f $stats_filename ]] && cat $stats_filename
 }
@@ -62,7 +62,7 @@ profile_lldb() {
     local stats_filename="${RESULTS_DIR}/${test_case_name}.json"
 
     # Run test-case and collect statistics.
-    eval "${profile_invocation} -o 'script -- f=open(\"${stats_filename}\",\"w\"); lldb.debugger.SetOutputFileHandle(f,True); lldb.debugger.HandleCommand(\"statistics dump\")' --batch -- ${debuggee_invocation}"
+    eval "${profile_invocation} -o 'script -- f=open(\"${stats_filename}\",\"w\"); lldb.debugger.SetOutputFileHandle(f,True); lldb.debugger.HandleCommand(\"statistics dump --summary\")' --batch -- ${debuggee_invocation}"
 
     [[ -f $stats_filename ]] && cat $stats_filename
 }