…ugLocation2

… LLVMValueRef, some that accept LLVMMetadataRef, and replacing one with another not always possible without explicit convertion

… LLVMRustMetadataTypeInContext with LLVMMetadataTypeInContext

LLVMRustBuildCleanupPad -> LLVMBuildCleanupPad
LLVMRustBuildCleanupRet -> LLVMBuildCleanupRet
LLVMRustBuildCatchPad -> LLVMBuildCatchPad
LLVMRustBuildCatchRet -> LLVMBuildCatchRet
LLVMRustBuildCatchSwitch -> LLVMBuildCatchSwitch

LLVMRustBuildIntCast -> LLVMBuildIntCast2
LLVMRustAddHandler -> LLVMAddHandler

Turns out
- `owning_ref` is unsound due to `Box` aliasing stuff
- `rustc` doesn't need 99% of the `owning_ref` API
- `rustc` can use a far simpler abstraction that is `OwnedSlice`

The `listen_on` function in the example has a `port` option but doesn't
use it

…n-trait, r=petrochenkov

More descriptive error when qself path doesnt have a trait on the RHS of `as`

`<Ty as Enum>::Assoc` should report that `Enum` is a trait. Main question is whether to eagerly report the error, or raise it with `return Err(..)` -- i'll note that in an inline comment though.

cc ``@GuillaumeGomez`` who said this came up at a Paris Rust meetup.

r? ``@petrochenkov``

llvm: replace some deprecated functions, add fixmes

Replace some deprecated llvm functions, add FIXME's (for simpler future work), replace some rust custom functions with llvm ones.

…strieb

Yeet `owning_ref`

Based on the discussions from rust-lang#109948

This replaces `owning_ref` with a far simpler & safer abstraction.

Fixes rust-lang#109974

…ed-port-num-in-listen-on-fn, r=jyn514

chore(tcp): change a hardcoded port number in a doctest to `port` var

The `listen_on` function in the example has a `port` option but doesn't use it

… r=GuillaumeGomez

rustdoc: add test and bug fix for theme defaults

Part of rust-lang#66181