target/arm: Add sve infrastructure for page lookup

For contiguous predicated memory operations, we want to
minimize the number of tlb lookups performed.  We have
open-coded this for sve_ld1_r, but for correctness with
MTE we will need this for all of the memory operations.

Create a structure that holds the bounds of active elements,
and metadata for two pages.  Add routines to find those
active elements, lookup the pages, and run watchpoints
for those pages.

Temporarily mark the functions unused to avoid Werror.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200508154359.7494-10-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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