This series adds two features to objtool: - retpoline validation; it verifies no indirect jumps/calls are left in CONFIG_RETPOLINE=y builds.
includes fixups for kvm and others - asm-goto validation; allows asserting that a block of code is not reachable through a dynamic branch. After this it forces an asm-goto capable compiler to build arch/x86 and removes the fallback code for static_cpu_has(). After which we can use static_cpu_has() to guarantee a lack of dynamic branches, which is a requested feature for various spectre related things.
