Implement another D-specific pass: -dgc2stack This one promotes GC allocations to stack memory when it can determine it's safe to do so. Not all GC calls are recognized yet (in fact only one *is* recognized for now). Needs metadata, so disabled for LLVM versions that don't support it.

#ifndef LDC_GEN_AA_H
#define LDC_GEN_AA_H

DValue* DtoAAIndex(Loc& loc, Type* type, DValue* aa, DValue* key, bool lvalue);
DValue* DtoAAIn(Loc& loc, Type* type, DValue* aa, DValue* key);
void DtoAARemove(Loc& loc, DValue* aa, DValue* key);

#endif // LDC_GEN_AA_H