Submodule build contains modified content
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 1b53cb1d4..724f867f5 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -1916,7 +1916,6 @@ ubsan_hardening("c_array_bounds") {
   # the related warning about "unsafe-buffer-usage-in-static-sized-array",
   # since we know that the array bounds sanitizing will catch any out-of-
   # bounds accesses.
-  cflags = [ "-Wno-unsafe-buffer-usage-in-static-sized-array" ]
 }
 
 # Enable UBSan subset to ensure we always hit `return` statement in non-void
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 1b53cb1d4..51367ceb2 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -601,7 +601,6 @@ config("compiler") {
     # Flags for diagnostics.
     cflags += [ "-fcolor-diagnostics" ]
     if (!is_win) {
-      cflags += [ "-fdiagnostics-show-inlining-chain" ]
     } else {
       # Combine after https://github.com/llvm/llvm-project/pull/192241
       cflags += [ "/clang:-fdiagnostics-show-inlining-chain" ]
diff --git a/build/config/sanitizers/sanitizers.gni b/build/config/sanitizers/sanitizers.gni
index 329a2fc8b..083b635e3 100644
--- a/build/config/sanitizers/sanitizers.gni
+++ b/build/config/sanitizers/sanitizers.gni
@@ -535,12 +535,6 @@ template("ubsan_hardening") {
         "-fsanitize=${invoker.sanitizer}",
         "-fsanitize-trap=${invoker.sanitizer}",
 
-        # Prevents `__has_feature(undefined_behavior_sanitizer)`
-        # from evaluating true. Configs defined here are intended to
-        # be usable even in release builds, i.e. as widely as possible.
-        # It's important not to have full-on UBSan workarounds activate
-        # just because we built support for a specific sanitizer.
-        "-fsanitize-ignore-for-ubsan-feature=${invoker.sanitizer}",
       ]
       if (defined(invoker.cflags)) {
         cflags += invoker.cflags
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index ff8022f04..59699e1d4 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -625,13 +625,6 @@ config("compiler") {
       ]
     }
 
-    # The performance improvement does not seem worth the risk. See
-    # https://crbug.com/484082200 for background and https://crrev.com/c/7593035
-    # for discussion.
-    if (!is_wasm) {
-      cflags += [ "-fno-lifetime-dse" ]
-    }
-
     # TODO(hans): Remove this once Clang generates better optimized debug info
     # by default. https://crbug.com/765793
     cflags += [