cosmetic: gitignore packcc.dSYM

[iaalm]

packcc.dSYM is generated during compile in OSX

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.87%. Comparing base (4df2e10) to head (b423c80).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4350   +/-   ##
=======================================
  Coverage   85.87%   85.87%           
=======================================
  Files         252      252           
  Lines       62600    62600           
=======================================
  Hits        53758    53758           
  Misses       8842     8842           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[masatake]

Thank you.