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Fix some race conditions in xca6ll/hot/amcssth.
* Use memory-model-aware builtins in GCC and Clang when a memory location may be written by one thread and read by another, avoiding race conditions due to out-of-order updates on ARM. * Call dylan_make_wrappers while the test is still single-threaded, preventing multiple threads from racing to call it. * Prevent dylan_init from creating a padding object, as we must not have an exact root pointing at a padding object.
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