Fix a bunch of non-determinism issues in the refcounter

src/codegen/irgen.cpp

@@ -496,7 +496,7 @@ static void emitBBs(IRGenState* irstate, TypeAnalysis* types, const OSREntryDesc
 
     std::unordered_map<CFGBlock*, SymbolTable*> ending_symbol_tables;
     std::unordered_map<CFGBlock*, ConcreteSymbolTable*> phi_ending_symbol_tables;
-    typedef std::unordered_map<InternedString, std::pair<ConcreteCompilerType*, llvm::PHINode*>> PHITable;
+    typedef std::map<InternedString, std::pair<ConcreteCompilerType*, llvm::PHINode*>> PHITable;
     std::unordered_map<CFGBlock*, PHITable*> created_phis;
     std::unordered_map<CFGBlock*, llvm::SmallVector<IRGenerator::ExceptionState, 2>> incoming_exception_state;
 

src/codegen/parser.cpp

@@ -590,8 +590,8 @@ AST_Module* read_module(BufferedReader* reader) {
     AST_Module* rtn = new AST_Module(reader->createInternedPool());
 
     readStmtVector(rtn->body, reader);
-    rtn->col_offset = -1;
-    rtn->lineno = -1;
+    rtn->col_offset = 0;
+    rtn->lineno = 0;
     return rtn;
 }