Auto merge of #77198 - jonas-schievink:rollup-i59i41h, r=jonas-schievink

Rollup of 15 pull requests

Successful merges:

 - #76932 (Relax promises about condition variable.)
 - #76973 (Unstably allow assume intrinsic in const contexts)
 - #77005 (BtreeMap: refactoring around edges)
 - #77066 (Fix dest prop miscompilation around references)
 - #77073 (dead_code: look at trait impls even if they don't contain items)
 - #77086 (Include libunwind in the rust-src component.)
 - #77097 (Make [].as_[mut_]ptr_range() (unstably) const.)
 - #77106 (clarify that `changelog-seen = 1` goes to the beginning of config.toml)
 - #77120 (Add `--keep-stage-std` to `x.py` for keeping only standard library artifacts)
 - #77126 (Invalidate local LLVM cache less often)
 - #77146 (Install std for non-host targets)
 - #77155 (remove enum name from ImplSource variants)
 - #77176 (Removing erroneous semicolon in transmute documentation)
 - #77183 (Allow multiple allow_internal_unstable attributes)
 - #77189 (Remove extra space from vec drawing)

Failed merges:

r? `@ghost`

compiler/rustc_mir/src/interpret/intrinsics.rs

@@ -435,6 +435,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 // These just return their argument
                 self.copy_op(args[0], dest)?;
             }
+            sym::assume => {
+                let cond = self.read_scalar(args[0])?.check_init()?.to_bool()?;
+                if !cond {
+                    throw_ub_format!("`assume` intrinsic called with `false`");
+                }
+            }
             _ => return Ok(false),
         }
 

compiler/rustc_mir/src/interpret/terminator.rs

@@ -390,9 +390,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             ty::InstanceDef::Virtual(_, idx) => {
                 let mut args = args.to_vec();
                 // We have to implement all "object safe receivers".  Currently we
-                // support built-in pointers (&, &mut, Box) as well as unsized-self.  We do
+                // support built-in pointers `(&, &mut, Box)` as well as unsized-self.  We do
                 // not yet support custom self types.
-                // Also see librustc_codegen_llvm/abi.rs and librustc_codegen_llvm/mir/block.rs.
+                // Also see `compiler/rustc_codegen_llvm/src/abi.rs` and `compiler/rustc_codegen_ssa/src/mir/block.rs`.
                 let receiver_place = match args[0].layout.ty.builtin_deref(true) {
                     Some(_) => {
                         // Built-in pointer.

compiler/rustc_mir/src/monomorphize/mod.rs

@@ -21,7 +21,7 @@ pub fn custom_coerce_unsize_info<'tcx>(
     });
 
     match tcx.codegen_fulfill_obligation((ty::ParamEnv::reveal_all(), trait_ref)) {
-        Ok(traits::ImplSourceUserDefined(traits::ImplSourceUserDefinedData {
+        Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {
             impl_def_id,
             ..
         })) => tcx.coerce_unsized_info(impl_def_id).custom_kind.unwrap(),

compiler/rustc_mir/src/transform/dest_prop.rs

@@ -905,7 +905,7 @@ impl<'a, 'tcx> Visitor<'tcx> for FindAssignments<'a, 'tcx> {
             // FIXME: This can be smarter and take `StorageDead` into account (which
             // invalidates borrows).
             if self.ever_borrowed_locals.contains(dest.local)
-                && self.ever_borrowed_locals.contains(src.local)
+                || self.ever_borrowed_locals.contains(src.local)
             {
                 return;
             }