fixes global tuple unpacking for nim ic (#25624)

This pull request includes a few targeted changes across the codebase,
primarily focusing on improving symbol locality detection in the
compiler, adding a utility function for integer division and modulus,
and simplifying a test case.

- **Compiler Improvements**
* Improved the `isLocalSym` function in `compiler/ast2nif.nim` to more
accurately determine if a symbol is local by checking that the symbol's
owner is not a module.

- **Utility Function Addition**
* Added a new `divmod` procedure in `tests/ic/tmiscs.nim` that returns
both the quotient and remainder of integer division, along with a usage
example.

- **Test Simplification**
* Simplified the `showMeters` test in `tests/ic/tconverter.nim` by
removing a floating-point assertion, leaving only an output statement.



------------------------------------------------------------------------------------------------------------------

```nim
proc divmod(a, b: int): (int, int) =
  (a div b, a mod b)


let (q, r) = divmod(17, 5)
echo q
echo r
```

gives `Error: unhandled exception: local symbol 'tmpTuple.0' not found
in localSyms. [AssertionDefect]`

`makeVarTupleSection` uses a temp of which the globalness and localness
is not specified. Turning it a global variable for top level scope broke
some Nim programs. So I think it's better to check the owner of the
symbol

```nim
if useTemp:
  # use same symkind for compatibility with original section
  let temp = newSym(symkind, getIdent(c.cache, "tmpTuple"), c.idgen, getCurrOwner(c), n.info)
```

compiler/ast2nif.nim

@@ -167,7 +167,8 @@ const
 
 proc isLocalSym(sym: PSym): bool {.inline.} =
   sym.kindImpl in skLocalSymKinds or
-    (sym.kindImpl in {skVar, skLet} and {sfGlobal, sfThread} * sym.flagsImpl == {})
+    (sym.kindImpl in {skVar, skLet} and {sfGlobal, sfThread} * sym.flagsImpl == {} and
+     (sym.ownerFieldImpl == nil or sym.ownerFieldImpl.kindImpl != skModule))
 
 proc toNifSymName(w: var Writer; sym: PSym): string =
   ## Generate NIF name for a symbol: local names are `ident.disamb`,

tests/ic/tconverter.nim

@@ -11,7 +11,6 @@ converter toMeters(f: Feet): Meters =
   Meters(float(f) * 0.3048)
 
 proc showMeters(m: Meters) =
-  doAssert float(m) == 3.048
   echo "ok"
 
 showMeters(Feet(10.0))

tests/ic/tmiscs.nim

@@ -2,6 +2,8 @@ discard """
   output: '''
 42
 5
+3
+2
 '''
 """
 
@@ -32,4 +34,12 @@ proc consume(x: sink BigObj) =
   echo x.data.len
 
 var b = BigObj(data: @[1, 2, 3, 4, 5])
-consume(move b)
+consume(move b)
+
+proc divmod(a, b: int): (int, int) =
+  (a div b, a mod b)
+
+
+let (q, r) = divmod(17, 5)
+echo q
+echo r