[1/N] Use std::string_view

[cyyever]

Another attempt to use STL.

[JackCaoG]

build failures seem real

2024-06-16T14:30:11.6423560Z     bazel-out/k8-opt/bin/external/torch/_virtual_includes/headers/torch/csrc/lazy/core/hash.h:240:26: error: no matching function for call to 'Hash(std::basic_string_view<char>&)'
2024-06-16T14:30:11.6425004Z       240 |   return HashCombine(Hash(value), MHash(Fargs...));
2024-06-16T14:30:11.6425646Z           |                      ~~~~^~~~~~~
2024-06-16T14:30:11.6427673Z     bazel-out/k8-opt/bin/external/torch/_virtual_includes/headers/torch/csrc/lazy/core/hash.h:66:8: note: candidate: 'template<class T, typename std::enable_if<std::is_arithmetic<_Tp>::value>::type* <anonymous> > torch::lazy::hash_t torch::lazy::Hash(const T&)'
2024-06-16T14:30:11.6429447Z        66 | hash_t Hash(const T& value) ***
2024-06-16T14:30:11.6429925Z           |        ^~~~
2024-06-16T14:30:11.6431094Z     bazel-out/k8-opt/bin/external/torch/_virtual_includes/headers/torch/csrc/lazy/core/hash.h:66:8: note:   template argument deduction/substitution failed:
2024-06-16T14:30:11.6433071Z     bazel-out/k8-opt/bin/external/torch/_virtual_includes/headers/torch/csrc/lazy/core/hash.h:65:68: error: no type named 'type' in 'struct std::enable_if<false, void>'
2024-06-16T14:30:11.6434434Z        65 |     typename std::enable_if<std::is_arithmetic<T>::value>::type* = nullptr>
2024-06-16T14:30:11.6435173Z           |                                                                    ^~~~~~~
2024-06-16T14:30:11.6436671Z     bazel-out/k8-opt/bin/external/torch/_virtual_includes/headers/torch/csrc/lazy/core/hash.h:72:18: note: candidate: 'torch::lazy::hash_t torch::lazy::Hash(const std::vector<bool>&)'
2024-06-16T14:30:11.6438023Z        72 | hash_t TORCH_API Hash(const std::vector<bool>& value);
2024-06-16T14:30:11.6438590Z           |                  ^~~~
2024-06-16T14:30:11.6440121Z     bazel-out/k8-opt/bin/external/torch/_virtual_includes/headers/torch/csrc/lazy/core/hash.h:72:48: note:   no known conversion for argument 1 from 'std::basic_string_view<char>' to 'const std::vector<bool>&'
2024-06-16T14:30:11.6441585Z        72 | hash_t TORCH_API Hash(const std::vector<bool>& value);
2024-06-16T14:30:11.6442201Z           |                       ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
2024-06-16T14:30:11.6443666Z     bazel-out/k8-opt/bin/external/torch/_virtual_includes/headers/torch/csrc/lazy/core/hash.h:75:22: note: candidate: 'torch::lazy::hash_t torch::lazy::Hash(const c10::ScalarType&)'
2024-06-16T14:30:11.6445028Z        75 | static inline hash_t Hash(const c10::ScalarType& value) ***

[cyyever]

@JackCaoG I have to patch upstream first.