[AArch64] Fix and add A64FX scheduling resource/latency info

1. Missing instruction information (FTSSEL, FMSB, PFIRST and RDFFR)
   is added and CompleteModel is set to one.

2. Information for pseudo SVE instructions is added. Those
   instructions are present at the time of scheduling.

3. Resource and latency information for SVE instructions is modified
   to be more accurate.
   For example, the description for CMPEQ, which consumes one cycle
   each of unit FLA and PPR, is as follows.
```
Previous:
  def A64FXGI01 : ProcResGroup<[A64FXIPFLA, A64FXIPPR]>;
  def A64FXWrite_4Cyc_GI01 : SchedWriteRes<[A64FXGI01]> {...
Modified:
  def A64FXGI0 : ProcResGroup<[A64FXIPFLA]>;
  def A64FXGI1 : ProcResGroup<[A64FXIPPR]>;
  def A64FXWrite_CMP : SchedWriteRes<[A64FXGI0, A64FXGI1]> {...
```

Reference: A64FX Microarchitecture Manual (Table 16-3)
https://github.com/fujitsu/A64FX/blob/master/doc/A64FX_Microarchitecture_Manual_en_1.7.pdf

Reviewed By: dmgreen, kawashima-fj

Differential Revision: https://reviews.llvm.org/D131165

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