am e166febb: am ded3f15e: am 782b98ea: Merge changes I3ca9ed36,Ibd7eec5c

* commit 'e166febbbca3301e074b26638beeeaa6040b13a7':
  Revert "Default to hiding libgcc symbols in each object."
  Revert "Don't apply --exclude-libs for the host."