[llvm] Add Addend Checks for MOVT and MOVW instructions. (PR #111970)

[David Spickett via llvm-commits]

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@@ -446,6 +447,16 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCAssembler &Asm,
                                          const MCSubtargetInfo* STI) const {
   unsigned Kind = Fixup.getKind();
 
+  // For MOVW/MOVT Instructions, the Fixup Value needs to be 16 bit aligned.
+  // If this is not the case, we should reject compilation.
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DavidSpickett wrote:

Second sentence seems redundant especially if you rephrase the first to:
```
// For MOVW/MOVT instructions, the fixup value must already be be 16-bit aligned.
```

https://github.com/llvm/llvm-project/pull/111970