[tools] skip code_space in mkgrokdump

The pointer to the first page of code space is not consistent and
therefore shouldn't be included in the mkgrokdump output.

No-Tree-Checks: true
Bug: v8:9844
Change-Id: I697c34e30e9b67b44e603e92d4bd3c7b81c1af3c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1856511
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64250}

test/mkgrokdump/mkgrokdump.cc

@@ -185,6 +185,10 @@ static int DumpHeapConstants(FILE* out, const char* argv0) {
       i::PrintF(out, "HEAP_FIRST_PAGES = {\n");
       i::PagedSpaceIterator it(heap);
       for (i::PagedSpace* s = it.Next(); s != nullptr; s = it.Next()) {
+        // Code page is different on Windows vs Linux (bug v8:9844), so skip it.
+        if (s->identity() == i::CODE_SPACE) {
+          continue;
+        }
         DumpSpaceFirstPageAddress(out, s);
       }
       DumpSpaceFirstPageAddress(out, read_only_heap->read_only_space());

tools/v8heapconst.py

@@ -427,7 +427,6 @@ KNOWN_OBJECTS = {
 # Lower 32 bits of first page addresses for various heap spaces.
 HEAP_FIRST_PAGES = {
   0x08180000: "old_space",
-  0x00040000: "code_space",
   0x081c0000: "map_space",
   0x08040000: "read_only_space",
 }