Use lookup_and_goto_tb.
Cleanup and fill in VMStateDescription.

# gpg: Signature made Mon 07 Sep 2020 21:01:55 BST
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-mb-20200907-2:
  configure: Do not set TARGET_ABI32 for microblaze
  target/microblaze: Put MicroBlazeCPUConfig into DisasContext
  target/microblaze: Fill in VMStateDescription for cpu
  target/microblaze: Move mmu parameters to MicroBlazeCPUConfig
  target/microblaze: Treat pvr_regs as constant
  target/microblaze: Move pvr regs to MicroBlazeCPUConfig
  target/microblaze: Reorg MicroBlazeCPUConfig to minimize holes
  target/microblaze: Split out MicroBlazeCPUConfig
  target/microblaze: Diagnose invalid insns in delay slots
  target/microblaze: Use tcg_gen_lookup_and_goto_ptr
  target/microblaze: Force rtid, rted, rtbd to exit
  target/microblaze: Handle DISAS_EXIT_NEXT in delay slot
  target/microblaze: Replace cpustate_changed with DISAS_EXIT_NEXT
  target/microblaze: Introduce DISAS_EXIT_NEXT, DISAS_EXIT_JUMP
  target/microblaze: Rename DISAS_UPDATE to DISAS_EXIT
  target/microblaze: Rename mmu structs
  target/microblaze: Cleanup mb_cpu_do_interrupt
  target/microblaze: Renumber D_FLAG

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>