Added a stripModifiers() function to remove shared|const|immutable storage classes in D2 (should eventually be moved to a dhelpers file rather than llvm helpers). Replaced a few occurances of STCinvariant with STCimmutable.

extern(C) int printf(char*, ...);
template Foo() { void test() { printf("test\n"); typeof(this).whee(); } }
class Bar { void whee() { printf("whee\n"); } mixin Foo!(); }
void main() { (new Bar).test(); }