newruntime: make 'discard new RootObj' work

compiler/ccgstmts.nim

@@ -227,8 +227,9 @@ proc blockLeaveActions(p: BProc, howManyTrys, howManyExcepts: int) =
   if not p.module.compileToCpp or optNoCppExceptions in p.config.globalOptions:
     # Pop exceptions that was handled by the
     # except-blocks we are in
-    for i in countdown(howManyExcepts-1, 0):
-      linefmt(p, cpsStmts, "#popCurrentException();$n", [])
+    if not p.noSafePoints:
+      for i in countdown(howManyExcepts-1, 0):
+        linefmt(p, cpsStmts, "#popCurrentException();$n", [])
 
 proc genGotoState(p: BProc, n: PNode) =
   # we resist the temptation to translate it into duff's device as it later

lib/core/runtime_v2.nim

@@ -48,7 +48,7 @@ proc nimNewObj(size: int): pointer {.compilerRtl.} =
     discard
   elif defined(useMalloc):
     var orig = c_malloc(s)
-    nimZeroMem(result, s)
+    nimZeroMem(orig, s)
     result = orig +! sizeof(RefHeader)
   else:
     result = alloc0(s) +! sizeof(RefHeader)