79620d8ac0
Implement atomic_*_explicit (e.g. atomic_store_explicit) with memory_order plus optional memory_scope. OpenCL memory_order maps 1:1 to Clang (e.g. OpenCL memory_order_relaxed == Clang __ATOMIC_RELAXED), so we pass it unchanged to clc_atomic_* function which forwards to Clang _scoped_atomic* builtins. Other changes: * Add __opencl_get_clang_memory_scope helper in opencl/utils.h (OpenCL scope -> Clang scope). * Correct atomic_compare_exchange return type to bool. * Fix atomic_compare_exchange to return true when value stored in the pointer equals expected value. * Remove volatile from CLC functions so that volatile isn't present in LLVM IR. * Add '-fdeclare-opencl-builtins -finclude-default-header' flag to include declaration of memory_scope. Some constants in libclc are already provided by Clang’s OpenCL header; disable those in OpenCL library build and enable them only for CLC library build.
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