[LLVM-542] Compiling zephyr with clang - Shared patches with Zephyr team lead, who has integrated them into a private branch and has locally fixed some of the incompatibilities/warnings - Went through the Zephyr samples to get build instructions for the ones compatible with Arm dev-boards.

[Intel-CET] patches to LLD (similar to BTI) - Reviewed patches and made suggestion for an alternative design. Will need to re-review the follow up this week.

[LLVM-523] .ARM.exidx redesign - Responded to review comments, will need to ping again this week.

Linaro Connect - Preparations for hack room - Started on Presentation on cross compilation, need to finish slides this week.