[AVR] Don't apply post-indexing on mismatched pointers #145224
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Cut out of llvm#145040; thanks to @tomtor for preparing the test. Basically, we're hitting the same edge case as RISC-V and aarch64: - https://github.com/llvm/llvm-project/blob/2ed089fb18b92ad668509076b9830f55d96d27fe/llvm/lib/Target/RISCV/RISCVISelLowering.cpp#L23545 - https://github.com/llvm/llvm-project/blob/2ed089fb18b92ad668509076b9830f55d96d27fe/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp#L27144 Closes llvm#143247.
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Cut out of #145040; thanks to @tomtor for preparing the test.
Basically, we're hitting the same edge case as RISC-V and aarch64:
llvm-project/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
Line 23545 in 2ed089f
Closes #143247; cc @benshi001.