triagebot: warn about #[rustc_intrinsic_const_stable_indirect]; make warnings a bit more noticeable

Author: RalfJung

triagebot.toml

@@ -1311,18 +1311,27 @@ cc = ["@m-ou-se"]
 [mentions."#[miri::intrinsic_fallback_is_spec]"]
 type = "content"
 message = """
-`#[miri::intrinsic_fallback_is_spec]` must only be used if the function actively checks for all UB cases,
+⚠️ `#[miri::intrinsic_fallback_is_spec]` must only be used if the function actively checks for all UB cases,
 and explores the possible non-determinism of the intrinsic.
 """
 cc = ["@rust-lang/miri"]
+
 [mentions."#[rustc_allow_const_fn_unstable"]
 type = "content"
 message = """
-`#[rustc_allow_const_fn_unstable]` needs careful audit to avoid accidentally exposing unstable
+⚠️ `#[rustc_allow_const_fn_unstable]` needs careful audit to avoid accidentally exposing unstable
 implementation details on stable.
 """
 cc = ["@rust-lang/wg-const-eval"]
 
+[mentions."#[rustc_intrinsic_const_stable_indirect]"]
+type = "content"
+message = """
+⚠️ `#[rustc_intrinsic_const_stable_indirect]` controls whether intrinsics can be exposed to stable const
+code; adding it needs t-lang approval.
+"""
+cc = ["@rust-lang/wg-const-eval"]
+
 
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 # PR assignments