Update revision for PNaCl

Update revision for PNaCl

Update 287c0fffd7d3b7f38b887324f261ddb724d38f26 -> 3e51032a7156a948d03edcc4e4a919ace972becf

Pull the following PNaCl changes into NaCl:
  3e51032: (dschuff@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
    | 44f58b6: (petar.jovanovic@rt-rk.com) [MIPS] Set pnacl-llc arguments for MIPS
    | 74a458c: (petar.jovanovic@rt-rk.com) [MIPS] Force UseReadOnlyJumpTables to true for NaCl subtarget
    | d62b2e9: (kschimpf@google.com) Fix handling of TYPE_CODE_NUMENTRY record when size large.
    | 9b9fd38: (kschimpf@google.com) Extend the munging bitcode records to generate text records.
    | 3389b3d: (kschimpf@google.com) Modify pnacl-{llc,thaw} to read textual bitcode records.
    | 93d4c96: (kschimpf@google.com) Make function readNaClRecordTextAndBuildBitcode public.
    | 8457aca: (kschimpf@google.com) Fix error category handling in textual bitcode reader.
    | 0606321: (jpp@chromium.org) Subzero. Adds x86-64 to the list of supported Subzero targets.
    | bf00952: (jpp@chromium.org) Removes x86_64 from ALL_TARGETS.
    | 9ad211b: (dschuff@chromium.org) Stub out DISubprograms that point to functions without dbg attachments

TBR=jfb@chromium.org
TEST=git cl try
(Please LGTM this change and tick the "commit" box)

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4195
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4169
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4211
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4077
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4200

Committed: https://chromium.googlesource.com/native_client/src/native_client/+/66c300e071cf3e1c1fb98f9a3e15bb02b4388d72

[Derek Schuff, 2015-06-24 20:19:13]

dschuff@chromium.org changed reviewers:
+ jfb@chromium.org

[Derek Schuff, 2015-06-24 20:40:06]

Committed patchset #1 (id:1) manually as
66c300e071cf3e1c1fb98f9a3e15bb02b4388d72 (presubmit successful).