[Instrumentor] Add Instrumentor pass (#138958) This commit adds the basic infrastructure for the Instrumentor pass, which allows instrumenting code in a simple and customizable way. This commit adds support for instrumenting load and store instructions. The Instrumentor can be configured with a JSON file that describes what should be instrumented, or can be used programmatically from another pass. The default JSON config file can be found in: `llvm/test/Instrumentation/Instrumentor/default_config.json`. More information about Instrumentor in the [RFC](https://discourse.llvm.org/t/rfc-introducing-instrumentor-easily-customizable-code-instrumentation/86020). This is only a squash commit of several contributions to the Instrumentor. The authors and contributors of this pass are: - Johannes Doerfert @jdoerfert - Kevin Sala @kevinsala - Ivan Radanov Ivanov @ivanradanov - Ethan Luis McDonough @EthanLuisMcDonough --------- Co-authored-by: Johannes Doerfert <johannes@jdoerfert.de> Co-authored-by: Ivan Radanov Ivanov <ivanov.i.aa@m.titech.ac.jp> Co-authored-by: Ethan Luis McDonough <ethanluismcdonough@gmail.com>
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