[clang] [clang][CUDA] Disable float128 diagnostics for device compilation (PR #83918)

[Pranav Kant via cfe-commits]

================
@@ -4877,7 +4877,9 @@ void Sema::AddModeAttr(Decl *D, const AttributeCommonInfo 
&CI,
     NewElemTy = Context.getRealTypeForBitwidth(DestWidth, ExplicitType);
 
   if (NewElemTy.isNull()) {
-    Diag(AttrLoc, diag::err_machine_mode) << 1 /*Unsupported*/ << Name;
+    // Only emit diagnostic on host for 128-bit mode attribute
----------------
pranavk wrote:

This is going to error out like this:

```
error: 'a' requires 128 bit size '__float128' type support, but target 
'nvptx64-nvidia-cuda' does not support it
```

https://github.com/llvm/llvm-project/pull/83918
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