perf: Read initialized dependency reverse indexes directly

[xmakro]

Follow up of #157319

[Zalathar]

@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: 0c37179 (0c371795cfa064dbfdd6321537ca4b1a6c0024ff)
Base parent: 67e8d9d (67e8d9d65f33118199f9749343782cc287426587)

[rust-timer]

Finished benchmarking commit (0c37179): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.3%	[0.3%, 0.3%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.4%	[-0.4%, -0.4%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary -0.6%, secondary 1.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	4.8%	[3.6%, 5.8%]	6
Improvements ✅ (primary)	-0.6%	[-0.8%, -0.4%]	8
Improvements ✅ (secondary)	-3.8%	[-5.5%, -2.3%]	3
All ❌✅ (primary)	-0.6%	[-0.8%, -0.4%]	8

Cycles

Results (primary 0.3%, secondary -1.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.4%, 1.0%]	4
Regressions ❌ (secondary)	4.2%	[2.5%, 7.5%]	4
Improvements ✅ (primary)	-0.6%	[-0.7%, -0.5%]	2
Improvements ✅ (secondary)	-5.8%	[-11.2%, -2.4%]	6
All ❌✅ (primary)	0.3%	[-0.7%, 1.0%]	6

Binary size

Results (primary -0.0%, secondary -0.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.0%	[-0.1%, -0.0%]	41
Improvements ✅ (secondary)	-0.1%	[-0.1%, -0.0%]	8
All ❌✅ (primary)	-0.0%	[-0.1%, -0.0%]	41

Bootstrap: 493.573s -> 495.212s (0.33%)
Artifact size: 406.95 MiB -> 406.90 MiB (-0.01%)