Make heap page sizes 64KiB by default

Commit dde164e968e382d50b07ad4559468885cbff33ef decoupled incremental
marking from page sizes. This commit changes Ruby heap page sizes to
64KiB. Doing so will have several benefits:

1. We can use compaction on systems with 64KiB system page sizes (e.g.
   PowerPC).
2. Larger page sizes will allow Variable Width Allocation to increase
   slot sizes and embed larger objects.
3. Since commit 002fa2859962f22de8afdbeece04966ea57b7da9, macOS has 64
   KiB pages. Making page sizes 64 KiB will bring these systems to
   parity.

I have attached some bechmark results below.

Discourse:
    On Discourse, we saw much better p99 performance (e.g. for "categories"
    it went from 214ms on master to 134ms on branch, for "home" it went
    from 265ms to 251ms). We don’t see much change in p60, p75, and p90
    performance. We also see a slight decrease in memory usage by 1.04x.

    Branch RSS: 354.9MB
    Master RSS: 368.2MB

railsbench:
    On rails bench, we don’t see a big change in RPS or p99
    performance. We don’t see a big difference in memory usage.

    Branch RPS: 826.27
    Master RPS: 824.85

    Branch p99: 1.67
    Master p99: 1.72

    Branch RSS: 88.72MB
    Master RSS: 88.48MB

liquid:
    We don’t see a significant change in liquid performance.

    Branch parse & render: 28.653 I/s
    Master parse & render: 28.563 i/s

1 files changed, 1 insertions, 4 deletions

diff --git a/misc/lldb_cruby.py b/misc/lldb_cruby.py
index 15d17d46da..e7f7003214 100755
--- a/misc/lldb_cruby.py
+++ b/misc/lldb_cruby.py
@@ -12,10 +12,7 @@ import os
 import shlex
 import platform
 
-if platform.system() == 'Darwin':
-    HEAP_PAGE_ALIGN_LOG = 16
-else:
-    HEAP_PAGE_ALIGN_LOG = 14
+HEAP_PAGE_ALIGN_LOG = 16
 
 HEAP_PAGE_ALIGN_MASK = (~(~0 << HEAP_PAGE_ALIGN_LOG))
 HEAP_PAGE_ALIGN = (1 << HEAP_PAGE_ALIGN_LOG)