target-arm: A64: Add support for dumping AArch64 VFP register state

target-arm: A64: Add support for dumping AArch64 VFP register state

When dumping the current CPU state, we can also get a request
to dump the FPU state along with the CPU's integer state.

Add support to dump the VFP state when that flag is set, so that
we can properly debug code that modifies floating point registers.

Signed-off-by: Alexander Graf <agraf@suse.de>
[WN: Commit message tweak, rebased. Output all registers, two per-line.]
Signed-off-by: Will Newton <will.newton@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>