request (x86 + stack protector + paravirt + clang)

Please cherry-pick upstream commits:

d03db2b "compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations" 0e2e160 "x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h>" d0a8d93 "x86/paravirt: Make native_save_fl() extern inline"

To stable branches 4.4+. They will allow 4.4+ x86 kernels compiled with Clang and have the configs CONFIG_STACK_PROTECTOR_STRONG and CONFIG_PARAVIRT to boot. They also allow gcc 5.1+ users to have consistent `extern inline` semantics.

In response to: https://android-review.googlesource.com/c/kernel/common/+/716477#message-291...

One of these days I'll remember to cc stable in the commit message properly...sorry!