librustc_middle: Rename upvars query to upvars_mentioned

[arora-aman]

As part of supporting RFC 2229, we will be capturing all the Places that
were mentioned in the closure.

This commit modifies the name of the upvars query to upvars_mentioned.

r? @nikomatsakis @blitzerr @matthewjasper

[rust-highfive]

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[rust-highfive]

The job mingw-check of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

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##[section]Starting: Linux mingw-check
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Agent name: 'Azure Pipelines 2'
Agent machine name: 'fv-az619'
Current agent version: '2.169.0'
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16.04.6
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##[group]Virtual Environment
Environment: ubuntu-16.04
Version: 20200517.1
Included Software: https://github.com/actions/virtual-environments/blob/ubuntu16/20200517.1/images/linux/Ubuntu1604-README.md
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Agent running as: 'vsts'
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Downloading task: Bash (3.163.2)
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[command]/bin/bash --noprofile --norc /home/vsts/work/_temp/174c9356-eb0c-451c-987a-2ff46b11e93f.sh

##[section]Finishing: Disable git automatic line ending conversion
##[section]Starting: Checkout rust-lang/rust@refs/pull/72544/merge to s
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Version      : 1.0.0
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Step 7/7 : ENV SCRIPT python3 ../x.py test src/tools/expand-yaml-anchors &&            python3 ../x.py check --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu &&            python3 ../x.py build --stage 0 src/tools/build-manifest &&            python3 ../x.py test --stage 0 src/tools/compiletest &&            python3 ../x.py test src/tools/tidy &&            python3 ../x.py doc --stage 0 src/libstd &&            /scripts/validate-toolstate.sh
 ---> 537a01811900
Successfully built 537a01811900
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Built container sha256:537a018119009dc218456238dec90b5530050db1e2a1e166550c218003f6159d
---
    Checking rustc_feature v0.0.0 (/checkout/src/librustc_feature)
    Checking fmt_macros v0.0.0 (/checkout/src/libfmt_macros)
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---
    Checking rustc_trait_selection v0.0.0 (/checkout/src/librustc_trait_selection)
error[E0599]: no method named `upvars` found for struct `rustc_middle::ty::TyCtxt<'tcx>` in the current scope
    --> src/librustc_trait_selection/traits/error_reporting/suggestions.rs:1383:40
     |
1383 |         if let Some(upvars) = self.tcx.upvars(generator_did) {
     |                                        ^^^^^^ method not found in `rustc_middle::ty::TyCtxt<'tcx>`
error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.
error: could not compile `rustc_trait_selection`.
error: could not compile `rustc_trait_selection`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "check" "--target" "x86_64-unknown-linux-gnu" "-Zbinary-dep-depinfo" "-j" "2" "--release" "--color" "always" "--features" " llvm" "--manifest-path" "/checkout/src/rustc/Cargo.toml" "--message-format" "json-render-diagnostics"
failed to run: /checkout/obj/build/bootstrap/debug/bootstrap check
Build completed unsuccessfully in 0:04:52
== clock drift check ==
  local time: Sun May 24 18:30:11 UTC 2020
  local time: Sun May 24 18:30:11 UTC 2020
  network time: Sun, 24 May 2020 18:30:11 GMT
== end clock drift check ==

##[error]Bash exited with code '1'.
##[section]Finishing: Run build
##[section]Starting: Checkout rust-lang/rust@refs/pull/72544/merge to s
Task         : Get sources
Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
Version      : 1.0.0
Author       : Microsoft
Author       : Microsoft
Help         : [More Information](https://go.microsoft.com/fwlink/?LinkId=798199)
==============================================================================
Cleaning any cached credential from repository: rust-lang/rust (GitHub)
##[section]Finishing: Checkout rust-lang/rust@refs/pull/72544/merge to s
Cleaning up task key
Start cleaning up orphan processes.
Terminate orphan process: pid (4750) (python)
##[section]Finishing: Finalize Job

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[matthewjasper]

r? @matthewjasper
@bors r+

[bors]

📌 Commit c3edb15 has been approved by matthewjasper