ast dump for splice specifier and reflection splice type

[changkhothuychung]

Given this program

using info = decltype(^^int);

constexpr int f() { return 42; }
template <int T> constexpr int g() { return T; }



int Test() {
    int x = 11;
    int y = [:^^x:];

    int w = [:^^f:]();
    int z = [:^^g<42>:]();
}

Generated ast dump is

FunctionDecl 0x555e579f0118 <clang/test/Reflection/ast-dump-splice-specifier.cpp:18:1, line:49:1> line:18:6 Test 'void ()'
`-CompoundStmt 0x555e57a0ca28 <col:13, line:49:1>
  |-DeclStmt 0x555e579f0298 <line:19:5, col:15>
  | `-VarDecl 0x555e579f01f8 <col:5, col:13> col:9 used x 'int' cinit
  |   `-IntegerLiteral 0x555e579f0260 <col:13> 'int' 11
  |-DeclStmt 0x555e579f0468 <line:20:5, col:20>
  | `-VarDecl 0x555e579f02d0 <col:5, col:18> col:9 y 'int' cinit
  |   `-ImplicitCastExpr 0x555e579f0438 <col:13, col:18> 'int' <LValueToRValue>
  |     `-CXXSpliceExpr 0x555e579f0408 <col:13, col:18> 'int' lvalue
  |       |-SpliceSpecifier 0x555e579f03c8 <col:13, col:18>
  |       | `-CXXReflectExpr 0x555e579f0358 <col:15, col:17> 'meta::info'
  |       `-DeclRefExpr 0x555e579f03e8 <col:13> 'int' lvalue Var 0x555e579f01f8 'x' 'int'
  |-DeclStmt 0x555e579f0690 <line:31:5, col:22>
  | `-VarDecl 0x555e579f04a0 <col:5, col:21> col:9 w 'int' cinit
  |   `-CallExpr 0x555e579f0658 <col:13, col:21> 'int'
  |     `-ImplicitCastExpr 0x555e579f0640 <col:13, col:18> 'int (*)()' <FunctionToPointerDecay>
  |       `-CXXSpliceExpr 0x555e579f05d8 <col:13, col:18> 'int ()' lvalue
  |         |-SpliceSpecifier 0x555e579f0598 <col:13, col:18>
  |         | `-CXXReflectExpr 0x555e579f0528 <col:15, col:17> 'meta::info'
  |         `-DeclRefExpr 0x555e579f05b8 <col:13> 'int ()' lvalue Function 0x555e579efcd0 'f' 'int ()'
  `-DeclStmt 0x555e57a0ca10 <line:40:5, col:26>
    `-VarDecl 0x555e579f06c8 <col:5, col:25> col:9 z 'int' cinit
      `-CallExpr 0x555e57a0c9d8 <col:13, col:25> 'int'
        `-ImplicitCastExpr 0x555e57a0c9c0 <col:13, col:22> 'int (*)()' <FunctionToPointerDecay>
          `-CXXSpliceExpr 0x555e57a0c990 <col:13, col:22> 'int ()' lvalue
            |-SpliceSpecifier 0x555e57a0c8e0 <col:13, col:22>
            | `-CXXReflectExpr 0x555e57a0c870 <col:15, col:17> 'meta::info'
            `-DeclRefExpr 0x555e57a0c900 <col:13> 'int ()' lvalue Function 0x555e57a0c600 'g' 'int ()'
            ```

[changkhothuychung]

since we dont need to add code to ASTNodeTraverser.h now, I removed the code in JSONNodeDumper and just do TextNodeDumper now.