[clang] [llvm] [ARM] Adding diagnostics for mcmodel=tiny when used in invalid targets (PR #125643)

[Fangrui Song via cfe-commits]

================
@@ -1755,6 +1755,18 @@ Compilation *Driver::BuildCompilation(ArrayRef<const 
char *> ArgList) {
         << TC.getTriple().str();
   }
 
+  // Throw diagnosis if mcmodel=tiny option is passed for targets other than 
ARM
+  // or AArch64.
+  if (Arg *A = UArgs->getLastArg(options::OPT_mcmodel_EQ)) {
----------------
MaskRay wrote:

`tiny` is expected to work with AArch64.

https://github.com/llvm/llvm-project/pull/125643
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