AArch64 NCG doesn't support -falignment-sanitisation
Compiling a module with `-falignment-sanitisation` using aarch64 ncg produces the following error:
```
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.4.4:
getRegister' (monadic CmmMachOp):
%MO_AlignmentCheck_8_W64(R1)
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/GHC/Utils/Panic.hs:182:37 in ghc:GHC.Utils.Panic
pprPanic, called at compiler/GHC/CmmToAsm/AArch64/CodeGen.hs:651:14 in ghc:GHC.CmmToAsm.AArch64.CodeGen
Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.4.4:
getRegister' (monadic CmmMachOp):
%MO_AlignmentCheck_8_W64(R1)
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/GHC/Utils/Panic.hs:182:37 in ghc:GHC.Utils.Panic
pprPanic, called at compiler/GHC/CmmToAsm/AArch64/CodeGen.hs:651:14 in ghc:GHC.CmmToAsm.AArch64.CodeGen
Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
```
This is reported by ghc-9.4.4 on aarch64-darwin, though according to https://gitlab.haskell.org/ghc/ghc/-/blob/master/compiler/GHC/CmmToAsm/AArch64/CodeGen.hs#L653 , it's never implemented in the first place.
issue