Roll clang 335608:335864.

Ran `tools/clang/scripts/upload_revision.py 335864`.

Contains two notable changes:
- lld now increases section layout to 16 bytes for sections that
  are CFG targets, which makes CFG more precise on x86 and
  works around a crash bug in Microsoft's x86 emulator on arm.
- Wconstant-logical-operand now fires more often and finds more bugs.
  We fixed all new instances of this warning on all bots we know about.

Bug: 857012,857393
Change-Id: I9396f5bae9750a1abcb9f0b256e9caed7b6ccc71
Reviewed-on: https://chromium-review.googlesource.com/1118531Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571444}

tools/clang/scripts/update.py

@@ -27,7 +27,7 @@ import zipfile
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://chromium.googlesource.com/chromium/src/+/master/docs/updating_clang.md
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION = '335608'
+CLANG_REVISION = '335864'
 
 use_head_revision = bool(os.environ.get('LLVM_FORCE_HEAD_REVISION', '0')
                          in ('1', 'YES'))