[AArch64][SVE] Asm: Support for FCPY immediate instructions.

Predicated copy of floating-point immediate value to SVE vector,
along with MOV-aliases.

Reviewers: rengolin, fhahn, samparker, SjoerdMeijer, javed.absar

Reviewed By: javed.absar

Differential Revision: https://reviews.llvm.org/D47518



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333869 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed