[clang] [Clang] Add GCC's __builtin_stack_address() to Clang. (PR #121332)

[Timm Baeder via cfe-commits]

================
@@ -4782,6 +4782,30 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl 
GD, unsigned BuiltinID,
     Function *F = CGM.getIntrinsic(Intrinsic::frameaddress, AllocaInt8PtrTy);
     return RValue::get(Builder.CreateCall(F, Depth));
   }
+  case Builtin::BI__builtin_stack_address: {
+    IntegerType *SPRegType;
+    StringRef SPRegName;
+    switch (getTarget().getTriple().getArch()) {
+    case Triple::x86:
+      SPRegType = Int32Ty;
+      SPRegName = "esp";
+      break;
+    case Triple::x86_64:
+      SPRegType = Int64Ty;
+      SPRegName = "rsp";
+      break;
+    default:
+      llvm_unreachable("Intrinsic __builtin_stack_address is not supported for 
"
+                       "the target architecture");
+    }
----------------
tbaederr wrote:

Where is it ensured that this is actually unreachable?

https://github.com/llvm/llvm-project/pull/121332
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