fix incorrect usages of std::move and other compile errors

[tiancaishaonvjituizi]

PR types

Bug fixes

PR changes

Others

Describe

1. Fix incorrect usages of std::move in return statement: There is no performance gain when using std::move to return a local variable. What's more, std::move hinders return value optimization, and makes the performance even worse. Modern compilers like gcc9 and clang warn about these mis-uses and fail to compile because the warnings are treated as errors by paddle.

   For more details, see "Automatic move from local variables and parameters" section of https://en.cppreference.com/w/cpp/language/return#Notes, and also this stackoverflow link https://stackoverflow.com/questions/17473753/c11-return-value-optimization-or-move

2. Add copy constructor/assignment operator to fix the following gcc9 compile error.

In file included from /home/dev/files/repos/Paddle/paddle/phi/core/compat/op_utils.cc:15:
/home/dev/files/repos/Paddle/paddle/phi/core/compat/op_utils.h: In lambda function:
/home/dev/files/repos/Paddle/paddle/phi/core/compat/op_utils.h:154:65: error: implicitly-declared ‘phi::KernelSignature::KernelSignature(const phi::KernelSignature&)’ is deprecated [-Werror=deprecated-copy]
  154 |         return DefaultKernelSignatureMap::Instance().Get(op_type);
      |                                                                 ^
In file included from /home/dev/files/repos/Paddle/paddle/phi/core/compat/op_utils.h:20,
                 from /home/dev/files/repos/Paddle/paddle/phi/core/compat/op_utils.cc:15:
/home/dev/files/repos/Paddle/paddle/phi/core/compat/arg_map_context.h:69:20: note: because ‘phi::KernelSignature’ has user-provided ‘phi::KernelSignature& phi::KernelSignature::operator=(const phi::KernelSignature&)’
   69 |   KernelSignature& operator=(const KernelSignature& other) {
      |                    ^~~~~~~~
cc1plus: all warnings being treated as errors

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[tiancaishaonvjituizi]

这里是 follow 了 https://reviews.llvm.org/D70122 的改动。ArrayRef 这个类本身就是从 llvm 搬运的

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[zhiqiu]

LGTM

[tiancaishaonvjituizi]

@zhiqiu @chenwhql I fixed a conflict with develop branch. please review again, thanks