test: fix pool size assumption (#34554)

On 32-bit, this object falls into the 12-byte pool, which does not exist
on some platforms (such as Win32). Query for which pool this will land
into and test the track-allocation result accordingly.

Fixes a test added in #34391

Author: vtjnash

src/julia_internal.h

@@ -150,8 +150,8 @@ void gc_sweep_sysimg(void);
 static const int jl_gc_sizeclasses[] = {
 #ifdef _P64
     8,
-#elif MAX_ALIGN == 8
-    // ARM and PowerPC have max alignment of 8,
+#elif MAX_ALIGN > 4
+    // ARM and PowerPC have max alignment larger than pointer,
     // make sure allocation of size 8 has that alignment.
     4, 8,
 #else

test/cmdlineargs.jl

@@ -277,11 +277,16 @@ let exename = `$(Base.julia_cmd()) --startup-file=no`
         @test popfirst!(got) == "        - function f(x)"
         @test popfirst!(got) == "       80     []"
         if Sys.WORD_SIZE == 64
+            # P64 pools with 64 bit tags
             @test popfirst!(got) == "       32     Base.invokelatest(g, 0)"
             @test popfirst!(got) == "       48     Base.invokelatest(g, x)"
-        else
+        elseif 12 == (() -> @allocated ccall(:jl_gc_allocobj, Ptr{Cvoid}, (Csize_t,), 8))()
+            # See if we have a 12-byte pool with 32 bit tags (MAX_ALIGN = 4)
             @test popfirst!(got) == "       24     Base.invokelatest(g, 0)"
             @test popfirst!(got) == "       36     Base.invokelatest(g, x)"
+        else # MAX_ALIGN >= 8
+            @test popfirst!(got) == "       16     Base.invokelatest(g, 0)"
+            @test popfirst!(got) == "       48     Base.invokelatest(g, x)"
         end
         @test popfirst!(got) == "       80     []"
         @test popfirst!(got) == "        - end"