objtool-core-2020-06-01

 - Speed up objtool significantly, especially when there are large number of sections
 - Improve objtool's understanding of special instructions such as IRET,
   to reduce the number of annotations required
 - Implement 'noinstr' validation
 - Do baby steps for non-x86 objtool use
 - Simplify/fix retpoline decoding
 - Add vmlinux validation
 - Improve documentation
 - Fix various bugs and apply smaller cleanups

Signed-off-by: Ingo Molnar <mingo@kernel.org>