PPC: [wasm] Int64Lowering of Int64Add.

Port 1b230799364b7a6fbff3b0ffaee38bc06e19504b

Original commit message:
    Int64Add is lowered to a new turbofan operator, Int32AddPair. The new
    operator takes 4 inputs an generates 2 outputs. The inputs are the low
    word of the left input, high word of the left input, the low word of the
    right input, and high word of the right input. The ouputs are the low
    and high word of the result of the addition.

R=ahaas@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com

Review URL: https://codereview.chromium.org/1803113002

Cr-Commit-Position: refs/heads/master@{#34797}
8 files changed
tree: 456908ee47e0fe2c1df5da7445fc26ad86297e12
  1. benchmarks/
  2. build/
  3. docs/
  4. include/
  5. infra/
  6. samples/
  7. src/
  8. test/
  9. testing/
  10. third_party/
  11. tools/
  12. .clang-format
  13. .gitignore
  14. .ycm_extra_conf.py
  16. BUILD.gn
  17. ChangeLog
  19. codereview.settings
  20. DEPS
  22. LICENSE.strongtalk
  23. LICENSE.v8
  24. LICENSE.valgrind
  25. Makefile
  26. Makefile.android
  27. Makefile.nacl
  28. OWNERS
  29. PRESUBMIT.py
  30. README.md
  31. snapshot_toolchain.gni

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