[infra] Update rpmalloc revision

The recipe was broken when using rpmalloc (i.e. when
building for Linux only) because Clang was updated to
version 16, and that compiler now complains of unsafe
buffer usage when -Weverything is used.

The fix does:

- Update the rpmalloc revision to a more recent revision,
  which includes fixes for a previous warning issue.
  See [1] in particular.

- Add a -Wno-unsafe-buffer-usage compiler flag to ensure
  the library can be compiled.

[1] https://github.com/mjansson/rpmalloc/commit/f4732ee2b8a5a838cf52cfcd6bc4a44bdc084ef2

Bug: None

Change-Id: Ie6233d41d8657b073bcb9f79e9cbd0e4aa30b652
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/15021
Reviewed-by: Brett Wilson <brettw@chromium.org>

infra/recipes/gn.expected/ci_linux.json

diff --git a/infra/recipes/gn.expected/ci_linux.json b/infra/recipes/gn.expected/ci_linux.json
index 5c09522..27e7b3f 100644
--- a/infra/recipes/gn.expected/ci_linux.json
+++ b/infra/recipes/gn.expected/ci_linux.json
@@ -213,7 +213,7 @@
     "cmd": [
       "git",
       "checkout",
-      "b097fd0916500439721a114bb9cd8d14bd998683"
+      "668a7f81b588a985c6528b70674dbcc005d9cb75"
     ],
     "cwd": "[START_DIR]/rpmalloc",
     "infra_step": true,

infra/recipes/gn.expected/cipd_exists.json

diff --git a/infra/recipes/gn.expected/cipd_exists.json b/infra/recipes/gn.expected/cipd_exists.json
index c2a1553..64c1fb5 100644
--- a/infra/recipes/gn.expected/cipd_exists.json
+++ b/infra/recipes/gn.expected/cipd_exists.json
@@ -213,7 +213,7 @@
     "cmd": [
       "git",
       "checkout",
-      "b097fd0916500439721a114bb9cd8d14bd998683"
+      "668a7f81b588a985c6528b70674dbcc005d9cb75"
     ],
     "cwd": "[START_DIR]/rpmalloc",
     "infra_step": true,

infra/recipes/gn.expected/cipd_register.json

diff --git a/infra/recipes/gn.expected/cipd_register.json b/infra/recipes/gn.expected/cipd_register.json
index b877dc1..650b9da 100644
--- a/infra/recipes/gn.expected/cipd_register.json
+++ b/infra/recipes/gn.expected/cipd_register.json
@@ -213,7 +213,7 @@
     "cmd": [
       "git",
       "checkout",
-      "b097fd0916500439721a114bb9cd8d14bd998683"
+      "668a7f81b588a985c6528b70674dbcc005d9cb75"
     ],
     "cwd": "[START_DIR]/rpmalloc",
     "infra_step": true,

infra/recipes/gn.expected/cq_linux.json

diff --git a/infra/recipes/gn.expected/cq_linux.json b/infra/recipes/gn.expected/cq_linux.json
index 9bbd7d3..1259594 100644
--- a/infra/recipes/gn.expected/cq_linux.json
+++ b/infra/recipes/gn.expected/cq_linux.json
@@ -264,7 +264,7 @@
     "cmd": [
       "git",
       "checkout",
-      "b097fd0916500439721a114bb9cd8d14bd998683"
+      "668a7f81b588a985c6528b70674dbcc005d9cb75"
     ],
     "cwd": "[START_DIR]/rpmalloc",
     "infra_step": true,

infra/recipes/gn.py

diff --git a/infra/recipes/gn.py b/infra/recipes/gn.py
index a4277dc..7cb6229 100644
--- a/infra/recipes/gn.py
+++ b/infra/recipes/gn.py
@@ -29,7 +29,7 @@
 # On select platforms, link the GN executable against rpmalloc for a small 10% speed boost.
 RPMALLOC_GIT_URL = 'https://fuchsia.googlesource.com/third_party/github.com/mjansson/rpmalloc'
 RPMALLOC_BRANCH = '+upstream/develop'
-RPMALLOC_REVISION = 'b097fd0916500439721a114bb9cd8d14bd998683'
+RPMALLOC_REVISION = '668a7f81b588a985c6528b70674dbcc005d9cb75'
 
 # Used to convert os and arch strings to rpmalloc format
 RPMALLOC_MAP = {
@@ -199,15 +199,16 @@
               ['git', 'fetch', '--tags', RPMALLOC_GIT_URL, RPMALLOC_BRANCH])
           api.step('checkout', ['git', 'checkout', RPMALLOC_REVISION])
 
-        # Patch configure.py since to add -Wno-ignored-optimization-flag since
-        # Clang will now complain when `-funit-at-a-time` is being used.
+        # Patch configure.py since to add -Wno-unsafe-buffer-usage since Clang-16 will
+        # now complain about this when building rpmalloc (latest version only
+        # supports clang-15).
         build_ninja_clang_path = api.path.join(rpmalloc_src_dir, 'build/ninja/clang.py')
         build_ninja_clang_py = api.file.read_text('read %s' % build_ninja_clang_path,
                                                  build_ninja_clang_path,
                                                  "CXXFLAGS = ['-Wall', '-Weverything', '-Wfoo']")
         build_ninja_clang_py = build_ninja_clang_py.replace(
             "'-Wno-disabled-macro-expansion'",
-            "'-Wno-disabled-macro-expansion', '-Wno-ignored-optimization-argument'")
+            "'-Wno-disabled-macro-expansion', '-Wno-unsafe-buffer-usage'")
         api.file.write_text('write %s' % build_ninja_clang_path,
                             build_ninja_clang_path,
                             build_ninja_clang_py)