[SPIR-V] Support SPV_INTEL_arbitrary_precision_integers extension#250
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This patch adds support for TargetExtType/target(...) representing SPIR-V builtin types. After D135202, target(...) is the preferred way for representing SPIR-V builtin types in LLVM IR and the only working in the opaque pointer mode. In order to maintain compatibility with LLVM IR generated by older versions of Clang and LLVM/SPIR-V Translator, pointers-to-opaque-structs denoting SPIR-V/OpenCL builtin types will be translated to equivalent SPIR-V target extension types. This translation is only available in the typed pointer mode (-opaque-pointers=0). The relevant LIT tests with SPIR-V builtins were converted to use the new target(...) notation.
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I am considering extracting generating all instructions relevant to extensions (decorations, capabilities, etc.) out to a separate pass. I will prepare a an experimental pull request.
If it works out, I will consider extracting emitting capabilities also to a separate pass. Then SPIRVModuleAnalysis would truly be "analysis only" pass.
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This patch adds support for the SPV_INTEL_arbitrary_precision_integers extension, enums for new extensions (58-102), and other misc methods for checking extension and capabilities requirements.