fixes #16790; fixes #19075; put big arrays on the constant seqs; don't inline them in the VM; big performance boost (#21318)

* don't inline arrays in VM

* add a test for #19075

compiler/vmgen.nim

@@ -32,7 +32,7 @@ when defined(nimPreviewSlimSystem):
   import std/assertions
 
 import
-  strutils, ast, types, msgs, renderer, vmdef,
+  strutils, ast, types, msgs, renderer, vmdef, trees,
   intsets, magicsys, options, lowerings, lineinfos, transf, astmsgs
 
 from modulegraphs import getBody
@@ -2054,7 +2054,10 @@ proc gen(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags = {}) =
       genLit(c, n, dest)
     of skConst:
       let constVal = if s.astdef != nil: s.astdef else: s.typ.n
-      gen(c, constVal, dest)
+      if dontInlineConstant(n, constVal):
+        genLit(c, constVal, dest)
+      else:
+        gen(c, constVal, dest)
     of skEnumField:
       # we never reach this case - as of the time of this comment,
       # skEnumField is folded to an int in semfold.nim, but this code