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Ryan Houdek
636f8aa4a7
Arm64 store with writeback when source register is the same register as the address is undefined behaviour. Depending on hardware details this can do a whole bunch of things. This situation happens when the x86 code does `push rsp` which is quite common for applications to do. We would then convert this to a `str x8, [x8, #-8]!` Which results in undefined behaviour. Now that redundant loads are optimized this showed up as an issue. Adds a unit test to ensure we don't hit this again.