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

This pulls in the following LLVM changes:

d075a59: (kschimpf@google.com) Fix reading switch on pointer type for PNaCl Bitcode.
6db8ae2: (kschimpf@google.com) Simplify implementation of LLVM bitcode abbreviations.
9db6612: (kschimpf@google.com) Allow pnacl-abicheck to autodetect file format.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4050
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3996
TEST= PNaCl toolchain trybots
TBR= kschimpf@chromium.org

Review URL: https://codereview.chromium.org/868483002

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