KVM: PPC: Reimplement LOAD_VSX/STORE_VSX instruction mmio emulation with analyse_inst...

KVM: PPC: Reimplement LOAD_VSX/STORE_VSX instruction mmio emulation with analyse_instr() input

This patch reimplements LOAD_VSX/STORE_VSX instruction MMIO emulation with
analyse_instr() input. It utilizes VSX_FPCONV/VSX_SPLAT/SIGNEXT exported
by analyse_instr() and handle accordingly.

When emulating VSX store, the VSX reg will need to be flushed so that
the right reg val can be retrieved before writing to IO MEM.

[[email protected] - mask the register number to 5 bits.]

Suggested-by: Paul Mackerras <[email protected]>
Signed-off-by: Simon Guo <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>