[Flang][OpenMP] Provide option to use heap allocation for private adjustable arrays (#186795) The size of adjustable Fortran arrays is not known at compilation time. Using limited GPU stack memory may cause hard-to-debug errors. On the other hand, switching to heap memory allocation may lead to missed optimization opportunities and significantly increased kernel execution time. Adding the option `-mmlir --enable-gpu-heap-alloc` allows the user to generate valid code for adjustable Fortran arrays. The flag is off by default, so there is no efficiency penalty for code that does not use adjustable arrays.
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