Revert "cppgc: Enable pointer compression on all platforms but M1"

This reverts commit 6561d415.

Reason for revert: Adds ~300kb of code size, breaking
https://ci.chromium.org/ui/p/chromium/builders/try/fuchsia-binary-size/53196/overview

Original change's description:
> cppgc: Enable pointer compression on all platforms but M1
>
> M1 still seems to have some performance regressions on
> MotionMark/multiply.
>
> Bug: chromium:1325007
> Change-Id: I12ce44b8cef646f09a3c74ba533dfee8dffdd2ce
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3829540
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Anton Bikineev <bikineev@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82485}

Bug: chromium:1325007
Change-Id: Ib7aff1e1859ebd17cefd05c5f627a713f045fd26
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3831333
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82506}

BUILD.gn

@@ -843,9 +843,9 @@ if (cppgc_enable_caged_heap) {
   # Always enable young generation compile time flag if caged heap is enabled.
   cppgc_enable_young_generation = true
 
-  if (!is_mac || v8_current_cpu != "arm64") {
-    # Enable on all platforms but M1.
-    # TODO(1325007): Fix MotionMark regressions on M1.
+  if (is_linux || (is_mac && v8_current_cpu != "arm64") || is_win) {
+    # Always enable on desktop but avoid on ChromeOS for now (for stability
+    # reasons).
     cppgc_enable_pointer_compression = true
   }
 }