Revert "fixes #22058; invalid free with {.noSideEffect.} in template (#22088)"

This reverts commit 7b9b173476.

compiler/injectdestructors.nim

@@ -706,24 +706,6 @@ template handleNestedTempl(n, processCall: untyped, willProduceStmt = false) =
   of nkWhen: # This should be a "when nimvm" node.
     result = copyTree(n)
     result[1][0] = processCall(n[1][0], s)
-
-  of nkPragmaBlock:
-    var inUncheckedAssignSection = 0
-    let pragmaList = n[0]
-    for pi in pragmaList:
-      if whichPragma(pi) == wCast:
-        case whichPragma(pi[1])
-        of wUncheckedAssign:
-          inUncheckedAssignSection = 1
-        else:
-          discard
-    result = shallowCopy(n)
-    inc c.inUncheckedAssignSection, inUncheckedAssignSection
-    for i in 0 ..< n.len-1:
-      result[i] = p(n[i], c, s, normal)
-    result[^1] = maybeVoid(n[^1], s)
-    dec c.inUncheckedAssignSection, inUncheckedAssignSection
-
   else: assert(false)
 
 proc pRaiseStmt(n: PNode, c: var Con; s: var Scope): PNode =
@@ -753,7 +735,7 @@ proc pRaiseStmt(n: PNode, c: var Con; s: var Scope): PNode =
 
 proc p(n: PNode; c: var Con; s: var Scope; mode: ProcessMode): PNode =
   if n.kind in {nkStmtList, nkStmtListExpr, nkBlockStmt, nkBlockExpr, nkIfStmt,
-                nkIfExpr, nkCaseStmt, nkWhen, nkWhileStmt, nkParForStmt, nkTryStmt, nkPragmaBlock}:
+                nkIfExpr, nkCaseStmt, nkWhen, nkWhileStmt, nkParForStmt, nkTryStmt}:
     template process(child, s): untyped = p(child, c, s, mode)
     handleNestedTempl(n, process)
   elif mode == sinkArg:

tests/arc/tmalloc.nim

@@ -1,16 +0,0 @@
-discard """
-  matrix: "--mm:arc -d:useMalloc; --mm:arc"
-"""
-
-block: # bug #22058
-  template foo(): auto =
-    {.noSideEffect.}:
-      newSeq[byte](1)
-
-  type V = object
-    v: seq[byte]
-
-  proc bar(): V =
-    V(v: foo())
-
-  doAssert bar().v == @[byte(0)]