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H A Dmain.c05068c0d Fri Sep 12 13:06:48 GMT 2014 Peter Maydell <peter.maydell@linaro.org> 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: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>