[CIR][IR] Fix FuncOp duplicate attr printing (#609)

This patch ensures that only the pretty-print version of function param
and result attributes is printed. The tailing dictionary attributes are
no longer printed.

It also ensures some FuncOp tests are properly validating both parsing
and printing.

Author: sitio-couto

clang/lib/CIR/Dialect/IR/CIRDialect.cpp

@@ -2089,6 +2089,8 @@ void cir::FuncOp::print(OpAsmPrinter &p) {
           getLinkageAttrName(),
           getNoProtoAttrName(),
           getSymVisibilityAttrName(),
+          getArgAttrsAttrName(),
+          getResAttrsAttrName(),
       });
 
   if (auto aliaseeName = getAliasee()) {

clang/test/CIR/IR/func.cir

@@ -6,8 +6,12 @@ module {
     cir.return
   }
 
+  // Should print/parse function aliases.
+  // CHECK: cir.func @l1() alias(@l0)
   cir.func @l1() alias(@l0)
 
+  // Should print/parse variadic function types.
+  // CHECK: cir.func private @variadic(!s32i, ...) -> !s32i
   cir.func private @variadic(!s32i, ...) -> !s32i
 
   // Should accept call with only the required parameters.
@@ -28,18 +32,25 @@ module {
     cir.return
   }
 
-  // Should parse void return types.
+  // Should drop void return types.
+  // CHECK: cir.func @parse_explicit_void_func() {
   cir.func @parse_explicit_void_func() -> !cir.void {
     cir.return
   }
 
-  // Should parse omitted void return type.
+  // Should print/parse omitted void return type.
+  // CHECK: cir.func @parse_func_type_with_omitted_void() {
   cir.func @parse_func_type_with_omitted_void() {
     cir.return
   }
 
-  // Should parse variadic no-proto functions.
+  // Should print/parse variadic no-proto functions.
+  // CHECK: cir.func no_proto private @no_proto(...) -> !s32i
   cir.func no_proto private @no_proto(...) -> !s32i
-}
 
-// CHECK: cir.func @l0()
+  // Should print/parse argument and result attributes.
+  // CHECK: cir.func @parse_arg_res_attrs(%arg0: !u8i {cir.zeroext}) -> (!u8i {cir.zeroext}) {
+  cir.func @parse_arg_res_attrs(%0: !u8i {cir.zeroext}) -> (!u8i {cir.zeroext}) {
+    cir.return %0 : !u8i
+  }
+}