[X64] [hamarb123] Remove defensive copies in `System.Collections.Immutable`

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Build completed in 27 minutes.

Diffs

Found 258 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 38914980
Total bytes of diff: 38914980
Total bytes of delta: 0 (0.00 % of base)

0 total files with Code Size differences (0 improved, 0 regressed), 256 unchanged.

0 total methods with Code Size differences (0 improved, 0 regressed), 242232 unchanged.

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Artifacts:

• build-artifacts-main.zip (665 MB)
• build-clr-checked-main.zip (81 MB)
• build-artifacts-pr.zip (665 MB)
• build-clr-checked-pr.zip (81 MB)
• diff-frameworks.txt (440 B)
• jit-diffs-frameworks.zip (257 MB)
• build-logs.txt (1 MB)

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