Beautify dump format, add indent for nested struct and struct members, also fix test cases in dump-struct-builtin.c
for example:
struct:
struct A { int a; struct B { int b; struct C { struct D { int d; union E { int x; int y; } e; } d; int c; } c; } b; };
Before:
struct A { int a = 0 struct B { int b = 0 struct C { struct D { int d = 0 union E { int x = 0 int y = 0 } } int c = 0 } } }
After:
struct A { int a = 0 struct B { int b = 0 struct C { struct D { int d = 0 union E { int x = 0 int y = 0 } } int c = 0 } } }