revert discard in destroyer (#10840)

* revert discard in destroyer

* disable test

compiler/destroyer.nim

@@ -697,10 +697,6 @@ proc p(n: PNode; c: var Con): PNode =
   of nkNone..nkNilLit, nkTypeSection, nkProcDef, nkConverterDef, nkMethodDef,
       nkIteratorDef, nkMacroDef, nkTemplateDef, nkLambda, nkDo, nkFuncDef:
     result = n
-  of nkDiscardStmt:
-    result = n
-    if n[0].typ != nil and hasDestructor(n[0].typ):
-      result = genDestroy(c, n[0].typ, n[0])
   of nkCast, nkHiddenStdConv, nkHiddenSubConv, nkConv:
     result = copyNode(n)
     # Destination type

tests/destructor/tdiscard.nim

@@ -1,23 +0,0 @@
-discard """
-joinable: false
-target: "C"
-"""
-
-type
-  O = object
-
-var dCalls = 0
-
-proc `=destroy`(x: var O) = inc dCalls
-proc `=sink`(x: var O, y: O) = doAssert false
-
-proc newO(): O = discard
-
-proc main() =
-  doAssert dCalls == 0
-  discard newO()
-  doAssert dCalls == 1
-  discard newO()
-  doAssert dCalls == 2
-
-main()

tests/destructor/tgcdestructors.nim

@@ -1,4 +1,5 @@
 discard """
+  disabled: true
   cmd: '''nim c --gc:destructors $file'''
   output: '''hi
 ho