[AArch64][SVE2] Asm: support SVE2 Accumulate Group

Summary:
Patch adds support for the following instructions:

SVE2 bitwise shift and insert:
    * SRI, SLI

SVE2 bitwise shift right and accumulate:
    * SSRA, USRA, SRSRA, URSRA

SVE2 complex integer add:
    * CADD, SQCADD

SVE2 integer absolute difference and accumulate:
    * SABA, UABA

SVE2 integer absolute difference and accumulate long:
    * SABALB, SABALT, UABALB, UABALT

SVE2 integer add/subtract long with carry:
    * ADCLB, ADCLT, SBCLB, SBCLT

The specification can be found here:
https://developer.arm.com/docs/ddi0602/latest

Reviewed By: SjoerdMeijer

Differential Revision: https://reviews.llvm.org/D62204

llvm-svn: 361622
38 files changed
tree: d795f894b2bf0d54d2230ddc4b88cc0c03512a22
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. pstl/
  17. .arcconfig
  18. .clang-format
  19. .clang-tidy
  20. .gitignore
  21. README.md
README.md

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