perf: Add irq and exception return branch types

[ Upstream commit cedd3614 ]

This expands generic branch type classification by adding two more entries
there in i.e irq and exception return. Also updates the x86 implementation
to process X86_BR_IRET and X86_BR_IRQ records as appropriate. This changes
branch types reported to user space on x86 platform but it should not be a
problem. The possible scenarios and impacts are enumerated here.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1645681014-3346-1-git-send-email-anshuman.khandual@arm.com


Stable-dep-of: e5389977 ("perf/x86/lbr: Filter vsyscall addresses")
Signed-off-by: Sasha Levin <sashal@kernel.org>