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af91b45726
While many intrinsics use `.insn` to generate raw machine code from numbers, all ratified instructions can be symbolic using `.option` directives. By saving the assembler environment with `.option push` then modifying the architecture with `.option arch`, we can temporarily enable certain extensions (as we use `.option pop` immediately after the target instruction, surrounding environment is completely intact in this commit; *almost* completely intact in general). This commit modifies the `pause` *hint* intrinsic to use symbolic *instruction* because we want to expose it even if the Zihintpause extension is unavailable on the target.