MIPS: Fix 'MIPS: Followup [turbofan] Introduce new operators Float32SubPreserveNan and Float64SubPreserveNan.'

Port eff959bb5593668a82dfb5c04c464ddcb8a3315c

Original commit message:
Float32SubMinusZero and Float64SubMinusZero tests are failing because MIPS does not preserve NaN payload according to Wasm spec. Implemented macro-assembler methods that check for NaN operands, and return the qNaN value with preserved payload and sign bits.

TEST=cctest/test-run-wasm/Run_WasmFloat32SubMinusZero, cctest/test-run-wasm/Run_WasmFloat64SubMinusZero

Review-Url: https://codereview.chromium.org/2081993002
Cr-Commit-Position: refs/heads/master@{#37151}
2 files changed
tree: d0f0cf6bbea4e66835cc413d854c2b1f827a8d84
  1. benchmarks/
  2. build_overrides/
  3. docs/
  4. gni/
  5. gypfiles/
  6. include/
  7. infra/
  8. samples/
  9. src/
  10. test/
  11. testing/
  12. third_party/
  13. tools/
  14. .clang-format
  15. .gitignore
  16. .gn
  17. .ycm_extra_conf.py
  19. BUILD.gn
  20. ChangeLog
  22. codereview.settings
  23. DEPS
  25. LICENSE.fdlibm
  26. LICENSE.strongtalk
  27. LICENSE.v8
  28. LICENSE.valgrind
  29. Makefile
  30. Makefile.android
  31. Makefile.nacl
  32. OWNERS
  33. PRESUBMIT.py
  34. README.md
  35. snapshot_toolchain.gni

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