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This patch adds all the language-level function keywords defined in: https://github.com/ARM-software/acle/pull/188 (merged) https://github.com/ARM-software/acle/pull/261 (update after D148700 landed) The keywords are used to control PSTATE.ZA and PSTATE.SM, which are respectively used for enabling the use of the ZA matrix array and Streaming mode. This information needs to be available on call sites, since the use of ZA or streaming mode may have to be enabled or disabled around the call-site (depending on the IR attributes set on the caller and the callee). For calls to functions from a function pointer, there is no IR declaration available, so the IR attributes must be added explicitly to the call-site. With the exception of '__arm_locally_streaming' and '__arm_new_za' the information is part of the function's interface, not just the function definition, and thus needs to be propagated through the FunctionProtoType::ExtProtoInfo. This patch adds the defintions of these keywords, as well as codegen and semantic analysis to ensure conversions between function pointers are valid and that no conflicting keywords are set. For example, '__arm_streaming' and '__arm_streaming_compatible' are mutually exclusive. Differential Revision: https://reviews.llvm.org/D127762