Stop `llvm.expect`ing assert terminators

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -649,8 +649,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             return helper.funclet_br(self, bx, target, mergeable_succ);
         }
 
-        // Pass the condition through llvm.expect for branch hinting.
-        let cond = bx.expect(cond, expected);
+        // Because we're branching to a panic block (either a `#[cold]` one
+        // or an inlined abort), there's no need to `expect` it.
 
         // Create the failure block and the conditional branch to it.
         let lltarget = helper.llbb_with_cleanup(self, target);