Properly support thin ptrs that are only thin due to their param-env in asm macro

compiler/rustc_hir_analysis/src/check/intrinsicck.rs

@@ -33,14 +33,12 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
     pub fn new(
         tcx: TyCtxt<'tcx>,
         def_id: LocalDefId,
+        typing_env: ty::TypingEnv<'tcx>,
         get_operand_ty: impl Fn(&hir::Expr<'tcx>) -> Ty<'tcx> + 'a,
     ) -> Self {
         InlineAsmCtxt {
             tcx,
-            typing_env: ty::TypingEnv {
-                typing_mode: ty::TypingMode::non_body_analysis(),
-                param_env: ty::ParamEnv::empty(),
-            },
+            typing_env,
             target_features: tcx.asm_target_features(def_id),
             expr_ty: Box::new(get_operand_ty),
         }

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -110,7 +110,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     self.tcx.erase_regions(ty)
                 }
             };
-            InlineAsmCtxt::new(self.tcx, enclosing_id, expr_ty).check_asm(asm);
+            InlineAsmCtxt::new(self.tcx, enclosing_id, self.typing_env(self.param_env), expr_ty)
+                .check_asm(asm);
         }
     }
 

tests/ui/asm/conditionally-sized-ptr.rs

@@ -0,0 +1,12 @@
+//@ check-pass
+//@ needs-asm-support
+
+use std::arch::asm;
+
+fn _f<T>(p: *mut T) {
+    unsafe {
+        asm!("/* {} */", in(reg) p);
+    }
+}
+
+fn main() {}