[pseudo] Fix the incorrect parameters-and-qualifiers rule.

The parenthese body should be parameter-declaration-clause, rather
than parameter-declaration-list.

Reviewed By: sammccall

Differential Revision: https://reviews.llvm.org/D125479

clang-tools-extra/pseudo/lib/cxx.bnf

@@ -409,7 +409,7 @@ noptr-declarator := declarator-id
 noptr-declarator := noptr-declarator parameters-and-qualifiers
 noptr-declarator := noptr-declarator [ constant-expression_opt ]
 noptr-declarator := ( ptr-declarator )
-parameters-and-qualifiers := ( parameter-declaration-list_opt ) cv-qualifier-seq_opt ref-qualifier_opt noexcept-specifier_opt
+parameters-and-qualifiers := ( parameter-declaration-clause_opt ) cv-qualifier-seq_opt ref-qualifier_opt noexcept-specifier_opt
 trailing-return-type := -> type-id
 ptr-operator := * cv-qualifier-seq_opt
 ptr-operator := &

clang-tools-extra/pseudo/test/cxx/parameter-decl-clause.cpp

@@ -0,0 +1,14 @@
+// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+void foo2(int, ...);
+// CHECK:      translation-unit~simple-declaration := decl-specifier-seq init-declarator-list ;
+// CHECK-NEXT: ├─decl-specifier-seq~VOID :=
+// CHECK-NEXT: ├─init-declarator-list~noptr-declarator := noptr-declarator parameters-and-qualifiers
+// CHECK-NEXT: │ ├─noptr-declarator~IDENTIFIER :=
+// CHECK-NEXT: │ └─parameters-and-qualifiers := ( parameter-declaration-clause )
+// CHECK-NEXT: │   ├─( :=
+// CHECK-NEXT: │   ├─parameter-declaration-clause := parameter-declaration-list , ...
+// CHECK-NEXT: │   │ ├─parameter-declaration-list~INT :=
+// CHECK-NEXT: │   │ ├─, :=
+// CHECK-NEXT: │   │ └─... :=
+// CHECK-NEXT: │   └─) :=
+// CHECK-NEXT: └─; :=

clang-tools-extra/pseudo/test/cxx/unsized-array.cpp

@@ -1,6 +1,6 @@
 // RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
 void s(int[]);
-// CHECK:      parameter-declaration-list~parameter-declaration := decl-specifier-seq abstract-declarator
+// CHECK:      parameter-declaration-clause~parameter-declaration := decl-specifier-seq abstract-declarator
 // CHECK-NEXT: ├─decl-specifier-seq~INT := tok[3]
 // CHECK-NEXT: └─abstract-declarator~noptr-abstract-declarator := [ ]
 // CHECK-NEXT:   ├─[ := tok[4]