use immediate type instead

Author: Centri3

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -120,7 +120,7 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
                 self.call_intrinsic("llvm.expect.i1", &[args[0].immediate(), self.const_bool(true)])
             }
             sym::is_val_statically_known => self.call_intrinsic(
-                &format!("llvm.is.constant.{:?}", args[0].layout.llvm_type(self.cx)),
+                &format!("llvm.is.constant.{:?}", args[0].layout.immediate_llvm_type(self.cx)),
                 &[args[0].immediate()],
             ),
             sym::unlikely => self

library/core/src/intrinsics.rs

@@ -2554,7 +2554,8 @@ extern "rust-intrinsic" {
 // and thus compiling stage0 core doesn't work.
 #[rustc_const_stable(feature = "is_val_statically_known", since = "never")]
 #[cfg(bootstrap)]
-pub const unsafe fn is_val_statically_known<T: ~const crate::marker::Destruct>(_: T) -> bool {
+pub const unsafe fn is_val_statically_known<T>(t: T) -> bool {
+    mem::forget(t);
     false
 }