[libclc] Add generic implementation of some atomic functions in OpenCL spec section 6.15.12.7 (#146814) Add corresponding clc functions, which are implemented with clang __scoped_atomic builtins. OpenCL functions are implemented as a wrapper over clc functions. Also change legacy atomic_inc and atomic_dec to re-use the newly added clc_atomic_inc/dec implementations. llvm-diff only no change to atomic_inc and atomic_dec in bitcode. Notes: * Generic OpenCL built-ins functions uses __ATOMIC_SEQ_CST and __MEMORY_SCOPE_DEVICE for memory order and memory scope parameters. * OpenCL atomic_*_explicit, atomic_flag* built-ins are not implemented yet. * OpenCL built-ins of atomic_intptr_t, atomic_uintptr_t, atomic_size_t and atomic_ptrdiff_t types are not implemented yet. * llvm-diff shows no change to nvptx64--nvidiacl.bc and amdgcn--amdhsa.bc since __opencl_c_atomic_order_seq_cst and __opencl_c_atomic_scope_device are not defined in these two targets.
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