x86, bts: clear bts bits on fork

Status from this message: applied to tip/tracing/hw-branch-tracer, thanks,

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#	Subject and files	Size	Replies
1/3	x86, bts: clear bts bits on fork`arch/x86/kernel/process_32.c` `arch/x86/kernel/process_64.c` `kernel/fork.c`	+31 -5	1 reply
2/3	x86, bts: remove recursion from get_context`arch/x86/kernel/ds.c`	+25 ~~-33~~	1 reply
3/3	x86, bts: correctly report invalid bts records`arch/x86/kernel/ds.c`	+3 -0	1 reply

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