Rollup of 4 pull requests

[frewsxcv]

• Successful merges: make *most* maps private #41368, Implement a file-path remapping feature in support of debuginfo and reproducible builds #41508, Add missing OperandPair struct field index adjustments. Fixes #41479. #41529, Shrink the rust-src component #41546
• Failed merges: cache symbol names in ty::maps #41507, query for describe_def #41534

[frewsxcv]

@bors r+ p=10

[bors]

📌 Commit 4c725d2 has been approved by frewsxcv

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[bors]

⌛ Testing commit 4c725d2 with merge 097d9bc...

[bors]

💔 Test failed - status-travis

[aidanhs]

[00:21:06] warning: ../compiler-rt/lib/builtins/divdc3.c:21:1: warning: conflicting types for built-in function '__divdc3'
[00:21:06] warning:  __divdc3(double __a, double __b, double __c, double __d)
[00:21:06] warning:  ^
[00:21:06] warning: ../compiler-rt/lib/builtins/divsc3.c:21:1: warning: conflicting types for built-in function '__divsc3'
[00:21:06] warning:  __divsc3(float __a, float __b, float __c, float __d)
[00:21:06] warning:  ^
[00:21:06] warning: ../compiler-rt/lib/builtins/muldc3.c:21:1: warning: conflicting types for built-in function '__muldc3'
[00:21:06] warning:  __muldc3(double __a, double __b, double __c, double __d)
[00:21:06] warning:  ^
[00:21:06] warning: ../compiler-rt/lib/builtins/mulsc3.c:21:1: warning: conflicting types for built-in function '__mulsc3'
[00:21:06] warning:  __mulsc3(float __a, float __b, float __c, float __d)
[00:21:06] warning:  ^
[00:21:13] error: internal compiler error: /checkout/src/librustc_typeck/check/mod.rs:680: can't type-check body of DefId { krate: CrateNum(0), node: DefIndex(2147484335) => core/31cda99d85f5f93f25d91c8ad10a555f::intrinsics[0]::[0]::atomic_cxchg[0] }
[00:21:13]   --> /checkout/src/libcore/intrinsics.rs:67:5
[00:21:13]    |
[00:21:13] 67 |     pub fn atomic_cxchg<T>(dst: *mut T, old: T, src: T) -> (T, bool);
[00:21:13]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[00:21:13] 
[00:21:13] note: the compiler unexpectedly panicked. this is a bug.
[00:21:13] 

Seems legit

[aidanhs]

Unsure which PR that was from after a quick look (even if I was I don't know how to create a rollup), so all of the individual PRs are still queued (retried after appveyor network failures).

(particularly odd is that each of the PRs passed the travis PR check)