[SandboxVec] SandboxVectorizerIR Boilerplate (#189515) This patch introduces a new specialization of SandboxIR named SandboxVectorizerIR that contains the new Pack instruction (though it is just a placeholder for now). It also implements the necessary boilerplate in SandboxIR to support adding such specializations. Each specialization requires its own *Values.def file defining its new instructions. The new .def file also needs to be added to ValuesDefFilesList.def which allows SandboxIR to include entries from all specializations and populate structures like the Opcode enum, ClassID and others. Given that we need to include both .def files in several places, I had to (i) change the .def file to undefine its locally defined macros so that they won't get redefined in the next #include .def, and (ii) add the DEF_DISABLE_AUTO_UNDEF option to disable undefining the macros at the end because otherwise the user-specified DEF_ macros would be undefined by the time we reach the second .def file.
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