[main] Source code updates from dotnet/runtime

[dotnet-maestro]

Note

This is a codeflow update. It may contain both source code changes from
the source repo
as well as dependency updates. Learn more here.

This pull request brings the following source code changes

From https://github.com/dotnet/runtime

• Subscription: 6458ae35-db00-43d0-af59-e57a01ca3120
• Build: 20260507.21 (313539)
• Date Produced: May 8, 2026 1:12:52 AM UTC
• Commit: 10c9a33d6d86ad5ac2169e1017af7cb235ddd8b3
• Commit Diff: 06ca675...10c9a33
• Branch: main

Diff the source with this PR branch

darc vmr diff --name-only https://github.com/dotnet/runtime:10c9a33d6d86ad5ac2169e1017af7cb235ddd8b3..https://github.com/dotnet/dotnet:darc-main-ef5a3b19-9c4a-4d5d-b1a9-3c08a3b9546b

[dotnet-maestro]

Note

PRs from original repository included in this codeflow update:

• [cDAC] Update allowlist in LegacyFallbackHelper runtime#127887
• Fix cDAC x-plat dump tests: pre-zip payloads and exclude osx legs runtime#127871
• Inline remaining usages of OpenProcess on Unix runtime#127795
• [browser][coreclr] WASM-specific GC OS layer; no mmap/decommit runtime#127328
• Fix iOS arm64 CoreCLR crash from shared MethodDesc::CalliCookie slot runtime#127876
• [mobile] Skip localhost subdomain with trailing dot test on Android runtime#127862
• JIT: Restore EH-region check in if-conversion flow validation runtime#127450
• JIT: Remove redundant null checks for non-null PHIs runtime#127810
• Remove unsafe code from System.Linq.MaxMin runtime#127845
• [browser][coreCLR] Enable download retry by default and improve retry sequencing runtime#127559
• Fix WebSocket close single-consumer violation  runtime#127183
• Implement UnknownSizeFrame for locals with unknown size runtime#125491
• JIT: Clean up and unify SELECT opts runtime#127621
• Fix static analysis findings in GC bridge and NativeAOT runtime runtime#127893
• [clr-ios] Propagate XSLT ActiveIssue from base to derived test classes runtime#127788
• [Wasm RyuJIT] Codegen for reverse pinvoke/unmanagedcallersonly runtime#127751
• Remove unsafe code from System.Collections.BitArray runtime#127846
• Add test: MaxResponseContentBufferSize enforced against decompressed content (Brotli) runtime#127864
• Reduce Unsafe usage in primitive IBinaryInteger TryRead/TryWrite runtime#127913
• Fix arg iteration for reverse pinvokes runtime#127758
• Enable sccache for linux-x64 coreclr PR builds runtime#127882
• Fix for 126457 runtime#127050
• JIT: Fix untracked uses of lvLiveInOutOfHndlr runtime#127910
• [mobile] Skip ConcurrentDictionary reflection test on mobile platforms runtime#127861
• Fix DispatchProxy TypeLoadException for generic type arguments runtime#127925
• Add hw intrinsics pipeline for linux_arm64 runtime#127482
• Update and create documentation in build.cmd and build.sh for CoreCLR test builds runtime#126951

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[ViktorHofer]

dotnet/runtime@a6bc864 - @agocke @steveisok this breaks source-build due to a prebuilt

[akoeplinger]

Yeah I think we should use dotnet package download sccache in one of the .yml's instead so it is constrained to the runtime CI pipelines.