[clang] [CIR] Add binary operators (PR #132420)

[Andy Kaylor via cfe-commits]

================
@@ -570,13 +853,425 @@ mlir::Value CIRGenFunction::emitScalarExpr(const Expr *e) {
   return ScalarExprEmitter(*this, builder).Visit(const_cast<Expr *>(e));
 }
 
-[[maybe_unused]] static bool MustVisitNullValue(const Expr *e) {
+mlir::Value CIRGenFunction::emitPromotedScalarExpr(const Expr *e,
+                                                   QualType promotionType) {
+  if (!promotionType.isNull())
+    return ScalarExprEmitter(*this, builder).emitPromoted(e, promotionType);
+  return ScalarExprEmitter(*this, builder).Visit(const_cast<Expr *>(e));
+}
+
+[[maybe_unused]] static bool mustVisitNullValue(const Expr *e) {
   // If a null pointer expression's type is the C++0x nullptr_t, then
   // it's not necessarily a simple constant and it must be evaluated
   // for its potential side effects.
   return e->getType()->isNullPtrType();
 }
 
+/// If \p E is a widened promoted integer, get its base (unpromoted) type.
+static std::optional<QualType>
+getUnwidenedIntegerType(const ASTContext &astContext, const Expr *e) {
+  const Expr *base = e->IgnoreImpCasts();
+  if (e == base)
+    return std::nullopt;
+
+  QualType baseTy = base->getType();
+  if (!astContext.isPromotableIntegerType(baseTy) ||
+      astContext.getTypeSize(baseTy) >= astContext.getTypeSize(e->getType()))
+    return std::nullopt;
+
+  return baseTy;
+}
+
+/// Check if \p E is a widened promoted integer.
----------------
andykaylor wrote:

```suggestion
/// Check if \p e is a widened promoted integer.
```

https://github.com/llvm/llvm-project/pull/132420