Remove option_payload_ptr; redundant to offset_of

[GKFX]

The option_payload_ptr intrinsic is no longer required as offset_of supports traversing enums (#114208). This PR removes it in order to dogfood offset_of (as suggested at #106655 (comment)). However, it will not build until those changes reach beta (which I think is within the next 8 days?) so I've opened it as a draft.

[rustbot]

r? @petrochenkov

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[GKFX]

@rustbot blocked
@rustbot label F-offset_of

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[GKFX]

@rustbot ready

[GKFX]

@rustbot ready

[petrochenkov]

@bors r+

[bors]

📌 Commit 58ea02e has been approved by petrochenkov

It is now in the queue for this repository.

[bors]

⌛ Testing commit 58ea02e with merge 33688d2...

[bors]

☀️ Test successful - checks-actions
Approved by: petrochenkov
Pushing 33688d2 to master...

[rust-timer]

Finished benchmarking commit (33688d2): 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

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)	3.3%	[2.5%, 4.1%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.3%	[-3.6%, -3.0%]	2
All ❌✅ (primary)	-	-	0

Cycles

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

Binary size

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

Bootstrap: 678.285s -> 676.282s (-0.30%)
Artifact size: 313.84 MiB -> 313.83 MiB (-0.00%)