match assembly operand labels and order in INSTR_CREATE_ macros for ARM

From bruen...@google.com on November 17, 2014 17:42:25

The first batch of INSTR_CREATE_ macros for ARM are going to differ from assembly in at least the following ways:

Dsts are always first, while ARM asm has memory dsts later in the order
The macros are using Rd for load dsts where asm uses Rt
The macros are using Vn for single source operands for easy doxygen generation where asm uses Vm
The macros are using Vd and Rd for OP_vmov and OP_vdup dsts where asm uses Vm and Rt
The macros are using Vt and Vm for the srcs of OP_vcmp where asm uses Vd and Vm

Basically, the asm conventions have violations and exceptions that make them hard to program toward.