PNaCl: Update LLVM revision
PNaCl: Update LLVM revision

This pulls in:

19bfdca (mseaborn): PNaCl: Fix nacl-expand-ctors pass to handle llvm.global_ctors being zeroinitializer

BUG=none
TEST=trybots

Review URL: https://codereview.chromium.org/11184041

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10039 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client