[PHI][CINN] Fix grid sample kernel for big tensor #72628
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PR Category
Operator Mechanism
PR Types
Bug fixes
Description
分别实例化int和int64_t版本的GridSampleCudaKernel，并适当优化Kernel中的表达式
由于该Kernel的表达式属于“明显比较复杂”的级别，所以使用了分别实例化int和int64_t的方式实现int64支持
优化包括：
__restrict__限定符，这会让load/store使用non-coherence的版本，理论上更快一点性能粗略测试：
Pcard-85711