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...mentation ============================= XRay relies on statically inserted instrumentation points (implemented as nop-sleds) and a dynamic enable/disable mechanism implemented in a runtime library. As of this writing the implementation of the XRay prototype involves adding two pseudo-instructions (PATCHABLE_FUNCTION_ENTER, PATCHABLE_RET) that serve as placeholders for where the nop-sleds are to be emitted when lowering. PATCHABLE_FUNCTION_ENTER is an instruction that takes no operands and serves as a pure placeholder. PATCHABLE_RET effectively behaves as a return instruction (isReturn = true) and wraps whatever the...