86440cbc74
This PR fixes https://github.com/llvm/llvm-project/issues/122075. We prefer SPV_INTEL_optnone over SPV_EXT_optnone when both extensions are available, otherwise, when a target specifies a required extension explicitly rather than allowing any of those (e.g., by providing --spirv-ext=all command line argument), the Backend's behavior remains unchanged. An existing test case is updated to check the case of 2 alternative extensions available at the same time.