Update PrintStack signature in gdbinit

BUG=none
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1179053004

Cr-Commit-Position: refs/heads/master@{#28985}

tools/gdbinit

@@ -40,7 +40,7 @@ end
 
 # Print JavaScript stack trace.
 define jst
-print v8::internal::Isolate::Current()->PrintStack((FILE*) stdout)
+print v8::internal::Isolate::Current()->PrintStack((FILE*) stdout, 1)
 end
 document jst
 Print the current JavaScript stack trace