Merge 4.9.106 into android-4.9

Changes in 4.9.106
	objtool: Improve detection of BUG() and other dead ends
	objtool: Move checking code to check.c
	tools lib: Add for_each_clear_bit macro
	tools: add more bitmap functions
	tools: enable endian checks for all sparse builds
	tools include: Introduce linux/compiler-gcc.h
	radix tree test suite: Remove types.h
	tools include: Adopt __compiletime_error
	tools include: Introduce atomic_cmpxchg_{relaxed,release}()
	tools include: Add UINT_MAX def to kernel.h
	tools include: Adopt kernel's refcount.h
	perf tools: Force fixdep compilation at the start of the build
	perf tools: Move headers check into bash script
	tools include uapi: Grab copies of stat.h and fcntl.h
	tools include: Introduce linux/bug.h, from the kernel sources
	tools include: Adopt __same_type() and __must_be_array() from the kernel
	tools include: Move ARRAY_SIZE() to linux/kernel.h
	tools include: Drop ARRAY_SIZE() definition from linux/hashtable.h
	tools include: Include missing headers for fls() and types in linux/log2.h
	objtool: sync up with the 4.14.47 version of objtool
	objtool: Support GCC 8's cold subfunctions
	objtool: Support GCC 8 switch tables
	objtool: Detect RIP-relative switch table references
	objtool: Detect RIP-relative switch table references, part 2
	objtool: Fix "noreturn" detection for recursive sibling calls
	objtool, x86: Add several functions and files to the objtool whitelist
	perf/tools: header file sync up
	objtool: header file sync-up
	x86/xen: Add unwind hint annotations to xen_setup_gdt
	objtool: Enclose contents of unreachable() macro in a block
	Linux 4.9.106

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>