PNaCl: Update llvm revision in pnacl/COMPONENT_REVISIONS
PNaCl: Update llvm revision in pnacl/COMPONENT_REVISIONS

This pulls in the following LLVM change:

aa09f2c: (mseaborn@chromium.org) PNaCl dynamic linking: Fix handling of local relocations with addends

BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=4351
TEST= PNaCl toolchain trybots
TBR=phosek@chromium.org

Review URL: https://codereview.chromium.org/1698603002 .

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client