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[llvm-libtool] Emit warnings for files without symbols

Authored by alexander-shaposhnikov on Feb 11 2021, 1:46 PM.

Description

[llvm-libtool] Emit warnings for files without symbols

  1. Emit warnings for files without symbols.
  2. Add -no_warning_for_no_symbols.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D95843