target/arm: Handle watchpoints in sve_ld1_r

target/arm: Handle watchpoints in sve_ld1_r

Handle all of the watchpoints for active elements all at once,
before we've modified the vector register.  This removes the
TLB_WATCHPOINT bit from page[].flags, which means that we can
use the normal fast path via RAM.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200508154359.7494-13-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>