llvm-project

18d4ba59 - [LLVM][IR] Add location tracking to LLVM IR parser (#155797)

[LLVM][IR] Add location tracking to LLVM IR parser (#155797) This PR is part of the LLVM IR LSP server project ([RFC](https://discourse.llvm.org/t/rfc-ir-visualization-with-vs-code-extension-using-an-lsp-server/87773)) To be able to make a LSP server, it's crucial to have location information about the LLVM objects (Functions, BasicBlocks and Instructions). This PR adds: * Position tracking to the Lexer * A new AsmParserContext class, to hold the new position info * Tests to check if the location is correct The AsmParserContext can be passed as an optional parameter into the parser. Which populates it and it can be then used by other tools, such as the LSP server. The AsmParserContext idea was borrowed from MLIR. As we didn't want to store data no one else uses inside the objects themselves. But the implementation is different, this class holds several maps of Functions, BasicBlocks and Instructions, to map them to their location. And some utility methods were added to get the positions of the processed tokens.