[CIR] Fix unary op folding (#132269)

Unary ops had previously been omitted from the list of ops handled in
the CIRCanonicalizePass. Although the incubator code doesn't use them
directly, the mlir folding code does.

This change enables folding of unary ops by adding them to the list.

Author: andykaylor

clang/include/clang/CIR/MissingFeatures.h

@@ -110,7 +110,6 @@ struct MissingFeatures {
   static bool brCondOp() { return false; }
   static bool switchOp() { return false; }
   static bool tryOp() { return false; }
-  static bool unaryOp() { return false; }
   static bool selectOp() { return false; }
   static bool complexCreateOp() { return false; }
   static bool complexRealOp() { return false; }

clang/lib/CIR/Dialect/Transforms/CIRCanonicalize.cpp

@@ -121,15 +121,14 @@ void CIRCanonicalizePass::runOnOperation() {
     assert(!cir::MissingFeatures::brCondOp());
     assert(!cir::MissingFeatures::switchOp());
     assert(!cir::MissingFeatures::tryOp());
-    assert(!cir::MissingFeatures::unaryOp());
     assert(!cir::MissingFeatures::selectOp());
     assert(!cir::MissingFeatures::complexCreateOp());
     assert(!cir::MissingFeatures::complexRealOp());
     assert(!cir::MissingFeatures::complexImagOp());
     assert(!cir::MissingFeatures::callOp());
-    // CastOp here is to perform a manual `fold` in
-    // applyOpPatternsGreedily
-    if (isa<BrOp, ScopeOp, CastOp>(op))
+    // CastOp and UnaryOp are here to perform a manual `fold` in
+    // applyOpPatternsGreedily.
+    if (isa<BrOp, ScopeOp, CastOp, UnaryOp>(op))
       ops.push_back(op);
   });
 

clang/test/CIR/Transforms/canonicalize.cir

@@ -31,6 +31,14 @@ module {
   // CHECK-NEXT:   cir.return
   // CHECK-NEXT: }
 
+  cir.func @unary_not(%arg0: !cir.bool) -> !cir.bool {
+    %0 = cir.unary(not, %arg0) : !cir.bool, !cir.bool
+    %1 = cir.unary(not, %0) : !cir.bool, !cir.bool
+    cir.return %1 : !cir.bool
+  }
+  // CHECK:      cir.func @unary_not(%arg0: !cir.bool) -> !cir.bool
+  // CHECK-NEXT:   cir.return %arg0 : !cir.bool
+
   cir.func @cast1(%arg0: !cir.bool) -> !cir.bool {
     %0 = cir.cast(bool_to_int, %arg0 : !cir.bool), !s32i
     %1 = cir.cast(int_to_bool, %0 : !s32i), !cir.bool