Unify %.frames_list and %.frame into a single data structure, generalizing r1212

to all frames instead of just the outer-most one.

ir/irfunction.cpp

@@ -109,10 +109,10 @@ IrFunction::IrFunction(FuncDeclaration* fd)
     retArg = NULL;
     thisArg = NULL;
     nestArg = NULL;
-    elidedCtxList = false;
 
     nestedVar = NULL;
-    framesType = NULL;
+    frameType = NULL;
+    depth = 0;
     
     _arguments = NULL;
     _argptr = NULL;