buffer lexer errors in rustdoc syntax checking
The code isn't ideal (I really would like to display the errors inline), but this at least gets us to where we were before #63017.
Remove negative number check from float sqrt
It hasn't been UB to pass negative numbers to sqrt since https://reviews.llvm.org/D28797 which was included in LLVM 5.
rustdoc: Avoid panic when parsing codeblocks for playground links
`make_test` is also called when parsing codeblocks for the playground links so it should handle unwinds from the parser internally.
Fixes#63016
r? @GuillaumeGomez
Use self profile infrastructure for -Z time and -Z time-passes
There's no longer indentation for -Z time and -Z time-passes and duplicate timers between self profiling and -Z time-passes have been removed.
r? @wesleywiser
perf: Don't recurse into types that do not need normalizing
A bit speculative at this stage but profiling shows that type folding
takes up a substantial amount of time during normalization which may
indicate that many types may be folded despite there being nothing to
normalize
Extract `rustc_hir` out of `rustc`
The new crate contains:
```rust
pub mod def;
pub mod def_id;
mod hir;
pub mod hir_id;
pub mod itemlikevisit;
pub mod pat_util;
pub mod print;
mod stable_hash_impls;
pub use hir::*;
pub use hir_id::*;
pub use stable_hash_impls::HashStableContext;
```
Remains to be done in follow-up PRs:
- Move `rustc::hir::map` into `rustc_hir_map` -- this has to be a separate crate due to the `dep_graph` (blocked on https://github.com/rust-lang/rust/pull/67761).
- Move references to `rustc::hir` to `rustc_hir` where possible.
cc https://github.com/rust-lang/rust/issues/65031
r? @Zoxc
Introduce an option for disabling deduplication of diagnostics
With the intent of using it in UI tests (https://github.com/rust-lang/rust/pull/67122).
The option is boolean (`-Z deduplicate-diagnostics=yes/no`) and can be specified multiple times with later values overriding earlier values (`-Z deduplicate-diagnostics=no -Z deduplicate-diagnostics=yes` == `-Z deduplicate-diagnostics=yes`), so it can be set in a hierarchical way, e.g. UI testing infra may disable the deduplication by default with specific tests being able to enable it back.
* Removes unnecessary feature flag from track_caller test.
* Tests of panic internals no longer need to explicitly construct Location.
* Add #![warn(const_err)] to retain-never-const per @oli-obk.
* Add track_caller test with diverging function.
