[pseudo] Use the prebuilt cxx grammar for the lit tests, NFC.

[sammccall]

Can we make this the default value of the flag instead?

[hokein]

In D129074#3628221, @sammccall wrote:

Can we make this the default value of the flag instead?

Yeah, the default one is the cxx. But I found it is a bit clearer to explicitly mention it in the code. (also happy to remove all -grammar=%cxx-bnf-file).

[sammccall]

Up to you.

clang-tools-extra/pseudo/test/cxx/capture-list.cpp

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 // We loosely allow capture defaults in any position/multiple times.
 auto lambda = [&, &foo, bar(x), =]{};
 // CHECK:      lambda-introducer := [ capture-list ]
 // CHECK-NEXT: ├─[
 // CHECK-NEXT: ├─capture-list
 // CHECK-NEXT: │ ├─capture-list
 // CHECK-NEXT: │ │ ├─capture-list
 // CHECK-NEXT: │ │ │ ├─capture-list~& := tok[4]

clang-tools-extra/pseudo/test/cxx/declarator-function.cpp

 // The standard grammar allows an init-list with any declarator, including
 // a function declarator. This creates an ambiguity where a function-definition
 // is misparsed as a simple-declaration.
 // FIXME: eliminate this false parse.
 // XFAIL: *
 
-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 void s(){};
 // CHECK-NOT:      simple-declaration
 // CHECK:          function-definition := decl-specifier-seq declarator
 // function-body CHECK-NOT:      simple-declaration

clang-tools-extra/pseudo/test/cxx/declarator-var.cpp

 // The standard grammar allows an function-body to use any declarator, including
 // a non-function declarator. This creates an ambiguity where a
 // simple-declaration is misparsed as a function-definition.
 // FIXME: eliminate this false parse.
 // XFAIL: *
 
-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 void (*s)(){};
 // CHECK-NOT:      function-definition
 // CHECK:          init-declarator := declarator initializer
 // CHECK-NOT:      function-definition

clang-tools-extra/pseudo/test/cxx/empty-member-spec.cpp

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 class Foo {
 public:
 };
 // CHECK:      decl-specifier-seq~class-specifier := class-head { member-specification }
 // CHECK-NEXT: ├─class-head := class-key class-head-name
 // CHECK-NEXT: │ ├─class-key~CLASS := tok[0]
 // CHECK-NEXT: │ └─class-head-name~IDENTIFIER := tok[1]
 // CHECK-NEXT: ├─{ := tok[2]
 // CHECK-NEXT: ├─member-specification := access-specifier :
 // CHECK-NEXT: │ ├─access-specifier~PUBLIC := tok[3]
 // CHECK-NEXT: │ └─: := tok[4]
 // CHECK-NEXT: └─} := tok[5]

clang-tools-extra/pseudo/test/cxx/keyword.cpp

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 bool operator<();
 // CHECK:      translation-unit~simple-declaration := decl-specifier-seq init-declarator-list ;
 // CHECK-NEXT: ├─decl-specifier-seq~BOOL
 // CHECK-NEXT: ├─init-declarator-list~noptr-declarator := noptr-declarator parameters-and-qualifiers
 // CHECK-NEXT: │ ├─noptr-declarator~operator-function-id := OPERATOR operator-name
 // CHECK-NEXT: │ │ ├─OPERATOR
 // CHECK-NEXT: │ │ └─operator-name~<
 // CHECK-NEXT: │ └─parameters-and-qualifiers := ( )
 // CHECK-NEXT: │   ├─(
 // CHECK-NEXT: │   └─)
 // CHECK-NEXT: └─;

clang-tools-extra/pseudo/test/cxx/mixed-designator.cpp

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 // FIXME: tighten CHECK to CHECK-NEXT once numeric literals are unambiguous.
 auto x = { 1, .f = 2, [c]{3} };
 // CHECK:      initializer-clause~braced-init-list
 // CHECK-NEXT: ├─{ := tok[3]
 // CHECK-NEXT: ├─initializer-list
 // CHECK-NEXT: │ ├─initializer-list
 // CHECK-NEXT: │ │ ├─initializer-list~literal
 // CHECK:      │ │ ├─, := tok[5]

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

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -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/predefined-identifier.cpp

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 void s() {
   __func__;
   // CHECK: expression~__FUNC__ := tok[5]
 }

clang-tools-extra/pseudo/test/cxx/template-empty-type-parameter.cpp

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 template <typename> struct MatchParents;
 // CHECK: template-parameter-list~TYPENAME := tok[2]

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

-// RUN: clang-pseudo -grammar=%cxx-bnf-file -source=%s --print-forest | FileCheck %s
+// RUN: clang-pseudo -grammar=cxx -source=%s --print-forest | FileCheck %s
 void s(int[]);
 // 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]
 // CHECK-NEXT:   └─] := tok[5]