Make __rust_alloc_error_handler_should_panic a function

Author: dpaoliello

alloc/src/alloc.rs

@@ -429,10 +429,10 @@ pub mod __alloc_error_handler {
             // This symbol is emitted by rustc next to __rust_alloc_error_handler.
             // Its value depends on the -Zoom={panic,abort} compiler option.
             #[rustc_std_internal_symbol]
-            static __rust_alloc_error_handler_should_panic: u8;
+            fn __rust_alloc_error_handler_should_panic_v2() -> u8;
         }
 
-        if unsafe { __rust_alloc_error_handler_should_panic != 0 } {
+        if unsafe { __rust_alloc_error_handler_should_panic_v2() != 0 } {
             panic!("memory allocation of {size} bytes failed")
         } else {
             core::panicking::panic_nounwind_fmt(

std/src/alloc.rs

@@ -349,10 +349,10 @@ fn default_alloc_error_hook(layout: Layout) {
         // This symbol is emitted by rustc next to __rust_alloc_error_handler.
         // Its value depends on the -Zoom={panic,abort} compiler option.
         #[rustc_std_internal_symbol]
-        static __rust_alloc_error_handler_should_panic: u8;
+        fn __rust_alloc_error_handler_should_panic_v2() -> u8;
     }
 
-    if unsafe { __rust_alloc_error_handler_should_panic != 0 } {
+    if unsafe { __rust_alloc_error_handler_should_panic_v2() != 0 } {
         panic!("memory allocation of {} bytes failed", layout.size());
     } else {
         // This is the default path taken on OOM, and the only path taken on stable with std.