Trim and tidy includes in rustc_llvm

[Zalathar]

These includes tend to accumulate over time, and are usually only removed when something breaks in a new LLVM version, so it's nice to clean them up manually once in a while.

General strategy used for this PR:

• Remove all includes from LLVMWrapper.h that aren't needed by the header itself, transplanting them to individual source files as necessary.
• For each source file, temporarily remove each include if doing so doesn't cause a compile error.
• If a “required” include looks like it shouldn't be needed, try replacing it with its sub-includes, then trim that list.
• After doing all of the above, go back and re-add any removed include if the file does actually use things defined in that header, even if the header happens to also be included by something else.

[rustbot]

r? @cuviper

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[cuviper]

LGTM, as long as it does compile. 😉

@bors r+ rollup=iffy

[bors]

📌 Commit 920d277 has been approved by cuviper

It is now in the queue for this repository.

[bors]

⌛ Testing commit 920d277 with merge 6ddea26...

[rust-log-analyzer]

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test [run-make] tests\run-make\zero-extend-abi-param-passing ... ok
test [run-make] tests\run-make\test-benches ... ok
test [run-make] tests\run-make\share-generics-export-again ... ok
test [run-make] tests\run-make\rustc-crates-on-stable ... ok
Terminate batch job (Y/N)? 
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Post job cleanup.
[command]"C:\Program Files\Git\bin\git.exe" version
git version 2.47.0.windows.1

[bors]

💔 Test failed - checks-actions

[Zalathar]

@bors retry (unrelated timeout)

[bors]

⌛ Testing commit 920d277 with merge 4b198d6...

[bors]

☀️ Test successful - checks-actions
Approved by: cuviper
Pushing 4b198d6 to master...

[rust-timer]

Finished benchmarking commit (4b198d6): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (secondary -2.9%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.9%	[-3.5%, -2.3%]	2
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary -2.6%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.6%	[-3.1%, -2.3%]	4
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 781.973s -> 780.833s (-0.15%)
Artifact size: 335.37 MiB -> 335.34 MiB (-0.01%)