[DAGCombine][ARM] Enable extending masked loads

Add generic DAG combine for extending masked loads.

Allow us to generate sext/zext masked loads which can access v4i8,
v8i8 and v4i16 memory to produce v4i32, v8i16 and v4i32 respectively.

Differential Revision: https://reviews.llvm.org/D68337

llvm-svn: 375085
10 files changed
tree: 064a3f3e4404889dfb732aa7c0259bd1a138fba4
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libc/
  6. libclc/
  7. libcxx/
  8. libcxxabi/
  9. libunwind/
  10. lld/
  11. lldb/
  12. llgo/
  13. llvm/
  14. openmp/
  15. parallel-libs/
  16. polly/
  17. pstl/
  18. .arcconfig
  19. .clang-format
  20. .clang-tidy
  21. .git-blame-ignore-revs
  22. .gitignore
  23. README.md
README.md

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