Implement CompoundLiteralExpr

[yulvil]

TODO: Add compound_literal_expr.go in the ast package.

main.c

struct node {
        int x;
        int y;
};

int main() {
        struct node a[] = {{10,20},{30,40}};
        struct node b[] = {(struct node){10,20},(struct node){30,40}};
        return a[1].x + b[1].y;
}

c2go transpile main.c

panic: unknown node type: 'CompoundLiteralExpr 0x5646ed33f5b0 <col:21, col:40> 'struct node':'struct node' lvalue'

c2go ast main.c

TranslationUnitDecl 0x558ade1b3df0 <<invalid sloc>> <invalid sloc>
|-TypedefDecl 0x558ade1b42e8 <<invalid sloc>> <invalid sloc> implicit __int128_t '__int128'
| `-BuiltinType 0x558ade1b4040 '__int128'
|-TypedefDecl 0x558ade1b4348 <<invalid sloc>> <invalid sloc> implicit __uint128_t 'unsigned __int128'
| `-BuiltinType 0x558ade1b4060 'unsigned __int128'
|-TypedefDecl 0x558ade1b43d8 <<invalid sloc>> <invalid sloc> implicit __builtin_ms_va_list 'char *'
| `-PointerType 0x558ade1b43a0 'char *'
|   `-BuiltinType 0x558ade1b3e80 'char'
|-TypedefDecl 0x558ade1b4688 <<invalid sloc>> <invalid sloc> implicit __builtin_va_list 'struct __va_list_tag [1]'
| `-ConstantArrayType 0x558ade1b4630 'struct __va_list_tag [1]' 1
|   `-RecordType 0x558ade1b44b0 'struct __va_list_tag'
|     `-Record 0x558ade1b4428 '__va_list_tag'
|-RecordDecl 0x558ade1b46d8 <main.c:1:1, line:4:1> line:1:8 struct node definition
| |-FieldDecl 0x558ade1b4790 <line:2:2, col:6> col:6 x 'int'
| `-FieldDecl 0x558ade1b47e8 <line:3:2, col:6> col:6 referenced y 'int'
`-FunctionDecl 0x558ade1b4878 <line:6:1, line:11:1> line:6:5 main 'int ()'
  `-CompoundStmt 0x558ade201630 <col:12, line:11:1>
    |-DeclStmt 0x558ade2014c8 <line:8:2, col:63>
    | `-VarDecl 0x558ade1b4a18 <col:2, col:62> col:14 used b 'struct node [2]' cinit
    |   `-InitListExpr 0x558ade2013c0 <col:20, col:62> 'struct node [2]'
    |     |-ImplicitCastExpr 0x558ade201400 <col:21, col:40> 'struct node':'struct node' <LValueToRValue>
    |     | `-CompoundLiteralExpr 0x558ade2011f0 <col:21, col:40> 'struct node':'struct node' lvalue
    |     |   `-InitListExpr 0x558ade2011a0 <col:34, col:40> 'struct node':'struct node'
    |     |     |-IntegerLiteral 0x558ade1b4a98 <col:35> 'int' 10
    |     |     `-IntegerLiteral 0x558ade1b4ab8 <col:38> 'int' 20
    |     `-ImplicitCastExpr 0x558ade201420 <col:42, col:61> 'struct node':'struct node' <LValueToRValue>
    |       `-CompoundLiteralExpr 0x558ade201318 <col:42, col:61> 'struct node':'struct node' lvalue
    |         `-InitListExpr 0x558ade2012c8 <col:55, col:61> 'struct node':'struct node'
    |           |-IntegerLiteral 0x558ade201238 <col:56> 'int' 30
    |           `-IntegerLiteral 0x558ade201258 <col:59> 'int' 40
    `-ReturnStmt 0x558ade201618 <line:10:2, col:14>
      `-ImplicitCastExpr 0x558ade201600 <col:9, col:14> 'int' <LValueToRValue>
        `-MemberExpr 0x558ade2015c8 <col:9, col:14> 'int' lvalue .y 0x558ade1b47e8
          `-ArraySubscriptExpr 0x558ade2015a0 <col:9, col:12> 'struct node':'struct node' lvalue
            |-ImplicitCastExpr 0x558ade201588 <col:9> 'struct node *' <ArrayToPointerDecay>
            | `-DeclRefExpr 0x558ade2014e0 <col:9> 'struct node [2]' lvalue Var 0x558ade1b4a18 'b' 'struct node [2]'
            `-IntegerLiteral 0x558ade201508 <col:11> 'int' 1

Requires #264 to be fixed in order to test.

$ clang --version
clang version 3.8.1-24 (tags/RELEASE_381/final)
Target: x86_64-pc-linux-gnu

$ go version
go version go1.9.2 linux/amd64