Fixes for ptr array deref codegen (#11191)

* fixes for ptr array derefence codegen
* fix comments, make diff nicer

compiler/ccgexprs.nim

@@ -717,8 +717,10 @@ proc isCppRef(p: BProc; typ: PType): bool {.inline.} =
       skipTypes(typ, abstractInstOwned).kind == tyVar and
       tfVarIsPtr notin skipTypes(typ, abstractInstOwned).flags
 
-proc genDeref(p: BProc, e: PNode, d: var TLoc; enforceDeref=false) =
-  let mt = mapType(p.config, e.sons[0].typ)
+proc genDeref(p: BProc, e: PNode, d: var TLoc) =
+  let
+    enforceDeref = lfEnforceDeref in d.flags
+    mt = mapType(p.config, e.sons[0].typ)
   if mt in {ctArray, ctPtrToArray} and not enforceDeref:
     # XXX the amount of hacks for C's arrays is incredible, maybe we should
     # simply wrap them in a struct? --> Losing auto vectorization then?
@@ -2343,6 +2345,7 @@ proc genTupleConstr(p: BProc, n: PNode, d: var TLoc) =
       if it.kind == nkExprColonExpr: it = it.sons[1]
       initLoc(rec, locExpr, it, d.storage)
       rec.r = "$1.Field$2" % [rdLoc(d), rope(i)]
+      rec.flags.incl(lfEnforceDeref)
       expr(p, it, rec)
 
 proc isConstClosure(n: PNode): bool {.inline.} =