exec.c: Relax restrictions on watchpoint length and alignment
The current implementation of watchpoints requires that they have a power of 2 length which is not greater than TARGET_PAGE_SIZE and that their address is a multiple of their length. Watchpoints on ARM don't fit these restrictions, so change the implementation so they can be relaxed. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NRichard Henderson <rth@twiddle.net>
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