mark raw_vec::ptr with inline

[andjo403]

when a lot of vectors is used in a enum as in the example in #66617 if this function is not inlined and multiple cgus is used this results in huge compile times. with this fix the compile time is 6s from minutes for the example in #66617. I did not have the patience to wait for it to compile for more then 3 min.

[rust-highfive]

r? @joshtriplett

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[joshtriplett]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion

[bors]

⌛ Trying commit 88d1f31 with merge 35e31b36ab0b88482a02d490af328f51852bf292...

[bors]

☀️ Try build successful - checks-actions
Build commit: 35e31b36ab0b88482a02d490af328f51852bf292 (35e31b36ab0b88482a02d490af328f51852bf292)

[rust-timer]

Queued 35e31b36ab0b88482a02d490af328f51852bf292 with parent f5230fb, future comparison URL.

[rust-timer]

Finished benchmarking try commit (35e31b36ab0b88482a02d490af328f51852bf292): comparison url.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying rollup- to bors.

Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up.

@bors rollup=never
@rustbot modify labels: +S-waiting-on-review -S-waiting-on-perf

[andjo403]

a bit unfortunate increase for syn (what I can see that crate contains a lot of vec:s of the same type) but otherwise the perf looks ok.
I do not know how common the case to have large types with a lot of different vec:s like in #66617 is if that compile time degradation is ok or not.
but the compile time in the issue is improved many times compared with the 3% degradation for syn.

on the other hand this PR is maybe more a band-aid for this specific benchmark then a fix for the real problem.

[andjo403]

@joshtriplett what do you think close or not?

[m-ou-se]

@bors r+ rollup

[bors]

📌 Commit 88d1f31 has been approved by m-ou-se

[jonas-schievink]

@bors rollup=never

Has perf impact

[bors]

⌛ Testing commit 88d1f31 with merge ff6ee2a...

[bors]

☀️ Test successful - checks-actions
Approved by: m-ou-se
Pushing ff6ee2a to master...