[clang] [CIR] Add lowering for long-double increment/decrement (PR #190812)

[Andy Kaylor via cfe-commits]

================
@@ -694,7 +694,8 @@ class ScalarExprEmitter : public StmtVisitor<ScalarExprEmitter, mlir::Value> {
         return {};
       }
 
-      if (mlir::isa<cir::SingleType, cir::DoubleType>(value.getType())) {
+      if (mlir::isa<cir::SingleType, cir::DoubleType, cir::LongDoubleType>(
+              value.getType())) {
----------------
andykaylor wrote:

```suggestion
      if (cir::isAnyFloatingPointType(value.getType())) {
```
It's not clear to me why we're checking the type here at all. I see that half requires special handling if the target doesn't have native support for it. Do we need something like that for FP80 and FP128 or does Sema check that?

https://github.com/llvm/llvm-project/pull/190812