[clang] [CIR] Upstream support for emitting ignored statements (PR #130869)

[Erich Keane via cfe-commits]

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@@ -165,6 +165,33 @@ LValue CIRGenFunction::emitDeclRefLValue(const DeclRefExpr *e) {
   return LValue();
 }
 
+/// Emit code to compute the specified expression which
+/// can have any type.  The result is returned as an RValue struct.
+RValue CIRGenFunction::emitAnyExpr(const Expr *e, bool ignoreResult) {
+  switch (CIRGenFunction::getEvaluationKind(e->getType())) {
+  case cir::TEK_Scalar:
+    return RValue::get(emitScalarExpr(e));
+  case cir::TEK_Complex:
+    cgm.errorNYI(e->getSourceRange(), "emitAnyExpr: complex type");
+    return RValue::get(nullptr);
+  case cir::TEK_Aggregate:
+    cgm.errorNYI(e->getSourceRange(), "emitAnyExpr: aggregate type");
+    return RValue::get(nullptr);
+  }
+  llvm_unreachable("bad evaluation kind");
+}
+
+/// Emit code to compute the specified expression, ignoring the result.
+void CIRGenFunction::emitIgnoredExpr(const Expr *e) {
+  if (e->isPRValue()) {
+    assert(!cir::MissingFeatures::aggValueSlot());
+    return (void)emitAnyExpr(e, true);
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erichkeane wrote:

hah, this line is perhaps overly cute.

https://github.com/llvm/llvm-project/pull/130869