Roll clang+rust llvmorg-22-init-6852-g2384a6a2-4 : llvmorg-22-init-8940-g4d4cb757-1 / 99317ef14d0be42fa4039eea7c5ce50cb4e9aee7-4 : 15283f6fe95e5b604273d13a428bab5fc0788f5a-1

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/+log/2384a6a2..4d4cb757

https://chromium.googlesource.com/external/github.com/rust-lang/rust/+log/99317ef14d0b..15283f6fe95e

Ran: ./tools/clang/scripts/upload_revision.py 4d4cb757f94470b95458fcbe3b88332b212feeee

Also:
* ran gnrt_stdlib.py
* use immediate-abort for official builds for *all* crates (instead of
  just the stdlib) to deal with
  rust-lang/rust#146317.

Bug: 444224976,447200172
Disable-Rts: True
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Change-Id: I078392e5e8cd86b791906fc47aebafed25527097
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6980648
Commit-Queue: Nico Weber <[email protected]>
Reviewed-by: Nico Weber <[email protected]>
Auto-Submit: Alan Zhao <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1520848}
NOKEYCHECK=True
GitOrigin-RevId: 03ecd7d4ec31f8f07a659cbb19baf662012a1c8d

Author: alanzhao1

config/compiler/BUILD.gn

@@ -1165,10 +1165,18 @@ config("compiler") {
     # abort instead of unwinding when panic occurs. In official builds, panics
     # abort immediately (this is configured in the stdlib) to keep binary size
     # down. So we unconditionally match behaviour in unofficial too.
-    rustflags += [
-      "-Cpanic=abort",
-      "-Zpanic_abort_tests",
-    ]
+    if (is_official_build) {
+      rustflags += [
+        "-Zunstable-options",
+        "-Cpanic=immediate-abort",
+        "-Zpanic_abort_tests",
+      ]
+    } else {
+      rustflags += [
+        "-Cpanic=abort",
+        "-Zpanic_abort_tests",
+      ]
+    }
   }
 
   # crbug.com/397463803: Set this until CrOS' user enumeration is done; its

rust/BUILD.gn

@@ -95,8 +95,8 @@ config("panic_immediate_abort") {
   visibility = [ "//build/rust/std/rules:*" ]
   if (is_official_build) {
     rustflags = [
-      "--cfg",
-      "feature=\"panic_immediate_abort\"",
+      "-Zunstable-options",
+      "-Cpanic=immediate-abort",
     ]
   }
 }