llvm-project

903acc27 - [AArch64][PAC] Emit `!dbg` locations in `*_vfpthunk_` functions (#179688)

[AArch64][PAC] Emit `!dbg` locations in `*_vfpthunk_` functions (#179688) The usage of pointers to member functions with Pointer Authentication requires generation of `*_vfpthunk_` functions. These thunk functions can be later inlined and optimized by replacing the indirect call instruction with a direct one and then inlining that function call. In absence of `!dbg` metadata attached to the original call instruction, such inlining ultimately results in an assertion "!dbg attachment points at wrong subprogram for function" in the assertions-enabled builds. By manually executing `opt` with `-verify-each` option on the LLVM IR produced by the frontend, an actual issue can be observed: "inlinable function call in a function with debug info must have a !dbg location" after the replacement of indirect call instruction with the direct one takes place. This commit fixes the issue by attaching artificial `!dbg` locations to the original call instruction (as well as most other instructions in `*_vfpthunk_` function) the same way it is done for other compiler-generated helper functions.