[ARM64] Move register/register MOV handling into tablegen and improve diagnostics


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208527 91177308-0d34-0410-b5e6-96231b3b80d8
[ARM64] Correct more bounds checks/diagnostics for arithmetic shift operands


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208528 91177308-0d34-0410-b5e6-96231b3b80d8
[ARM64] Add diagnostics for bitfield extract/insert instructions

Unfortunately, since ARM64 models all these instructions as aliases,
the checks need to be done at the time the alias is seen rather than
during instruction validation as AArch64 does it.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208529 91177308-0d34-0410-b5e6-96231b3b80d8