Remove buildConfig from sccache cache key to share across PR/rolling builds

eng/pipelines/coreclr/templates/setup-sccache.yml

@@ -19,13 +19,20 @@ steps:
     # Set up the Azure Pipeline Cache for sccache's local cache directory.
     # Use a rolling key so each build can update the cache; restoreKeys
     # falls back to the most recent saved entry.
+    #
+    # buildConfig is intentionally excluded from the key: it reflects
+    # the *managed* Configuration (Debug for PRs, Release for rolling
+    # builds), but sccache only caches native (C/C++) compilations whose
+    # flags are controlled by RuntimeConfiguration (-rc), which is
+    # constant per leg regardless of buildConfig.  Omitting it lets PR
+    # builds warm-start from rolling-build caches saved in the main scope.
     - task: Cache@2
       displayName: Sccache cache
       inputs:
-        key: sccache | ${{ parameters.osGroup }} | ${{ parameters.archType }} | ${{ parameters.nameSuffix }} | ${{ parameters.buildConfig }} | "$(Build.BuildId)"
+        key: sccache | ${{ parameters.osGroup }} | ${{ parameters.archType }} | ${{ parameters.nameSuffix }} | "$(Build.BuildId)"
         path: $(Pipeline.Workspace)/.sccache
         restoreKeys: |
-          sccache | ${{ parameters.osGroup }} | ${{ parameters.archType }} | ${{ parameters.nameSuffix }} | ${{ parameters.buildConfig }}
+          sccache | ${{ parameters.osGroup }} | ${{ parameters.archType }} | ${{ parameters.nameSuffix }}
 
     # Configure sccache environment and add binary to PATH.
     # The sccache package is restored by runtime-prereqs.proj during the build.

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/Cng.NotSupported.cs

@@ -500,7 +500,7 @@ public partial CngKey GetKey()
             throw new PlatformNotSupportedException(SR.PlatformNotSupported_CryptographyCng);
         }
 
-        protected override partial void DeriveRawSecretAgreementCore(X25519DiffieHellman otherParty, Span<byte> destination)
+        protected override unsafe partial void DeriveRawSecretAgreementCore(X25519DiffieHellman otherParty, Span<byte> destination)
         {
             throw new PlatformNotSupportedException(SR.PlatformNotSupported_CryptographyCng);
         }

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/X25519DiffieHellmanCng.Windows.cs

@@ -37,7 +37,7 @@ public partial CngKey GetKey()
             return CngHelpers.Duplicate(_key.HandleNoDuplicate, _key.IsEphemeral);
         }
 
-        protected override partial void DeriveRawSecretAgreementCore(X25519DiffieHellman otherParty, Span<byte> destination)
+        protected override unsafe partial void DeriveRawSecretAgreementCore(X25519DiffieHellman otherParty, Span<byte> destination)
         {
             // We intentionally don't special case otherParty being an instance of X25519DiffieHellmanCng and always
             // export the public key into the current instance's provider.

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/X25519DiffieHellmanCng.cs

@@ -53,7 +53,7 @@ public sealed partial class X25519DiffieHellmanCng : X25519DiffieHellman
         public partial CngKey GetKey();
 
         /// <inheritdoc/>
-        protected override partial void DeriveRawSecretAgreementCore(X25519DiffieHellman otherParty, Span<byte> destination);
+        protected override unsafe partial void DeriveRawSecretAgreementCore(X25519DiffieHellman otherParty, Span<byte> destination);
 
         /// <inheritdoc/>
         protected override partial void ExportPublicKeyCore(Span<byte> destination);