[llvm] [AVR] 8 bit trunc regression (PR #152902)

[Tom Vijlbrief via llvm-commits]

tomtor wrote:

https://github.com/llvm/llvm-project/blob/16b044e9789d6b9dc9ec6ed7e5b98731e60e3fcd/llvm/lib/Analysis/InlineCost.cpp#L1811

Evaluates to true on AVR and to false on RISCV for the same code input...

https://github.com/llvm/llvm-project/pull/152902