rseq/selftests: Introduce __rseq_cs_ptr_array, rename __rseq_table to __rseq_cs

The entries within __rseq_table are aligned on 32 bytes due to
linux/rseq.h struct rseq_cs uapi requirements, but the start of the
__rseq_table section is not guaranteed to be 32-byte aligned. It can
cause padding to be added at the start of the section, which makes it
hard to use as an array of items by debuggers.

Considering that __rseq_table does not really consist of a table due to
the presence of padding, rename this section to __rseq_cs.

Create a new __rseq_cs_ptr_array section which contains 64-bit packed
pointers to entries within the __rseq_cs section.

Signed-off-by: Mathieu Desnoyers <[email protected]>
CC: Thomas Gleixner <[email protected]>
CC: Joel Fernandes <[email protected]>
CC: Peter Zijlstra <[email protected]>
CC: Catalin Marinas <[email protected]>
CC: Dave Watson <[email protected]>
CC: Will Deacon <[email protected]>
CC: Shuah Khan <[email protected]>
CC: Andi Kleen <[email protected]>
CC: [email protected]
CC: "H . Peter Anvin" <[email protected]>
CC: Chris Lameter <[email protected]>
CC: Russell King <[email protected]>
CC: Michael Kerrisk <[email protected]>
CC: "Paul E . McKenney" <[email protected]>
CC: Paul Turner <[email protected]>
CC: Boqun Feng <[email protected]>
CC: Josh Triplett <[email protected]>
CC: Steven Rostedt <[email protected]>
CC: Ben Maurer <[email protected]>
CC: [email protected]
CC: Andy Lutomirski <[email protected]>
CC: Andrew Morton <[email protected]>
CC: Linus Torvalds <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

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