PP: Add missing atoms that effect -E mode.

When preprocessing only, some tokens were emitted as <bad token>.
This fixes them to preserve their original content.

This supplants PR #182, with a correction and test results.

Test/preprocessor.simple.vert

@@ -19,4 +19,11 @@ int main() {
   gl_Position = vec4(Z);
   gl_Position = vec4(F);
   gl_Position = vec4(fn(3));
+  [] . ++ --
+  + - * % / - ! ~
+  << >> < > <= >=
+  == !=
+  & ^ | && ^^ || ? :
+  += -= *= /= %= <<= >>= &= |= ^=
+  1.2 2E10 5u -5lf
 }