retpoline: Introduce start/end markers of indirect thunk

Introduce start/end markers of __x86_indirect_thunk_* functions.
To make it easy, consolidate .text.__x86.indirect_thunk.* sections
to one .text.__x86.indirect_thunk section and put it in the
end of kernel text section and adds __indirect_thunk_start/end
so that other subsystem (e.g. kprobes) can identify it.

Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: David Woodhouse <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/151629206178.10241.6828804696410044771.stgit@devbox

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