Revert "Disable some optimizations on Windows" (swiftlang#9225)

Author: Steelskin

Sources/PackageLoading/ManifestLoader.swift

@@ -679,11 +679,6 @@ public final class ManifestLoader: ManifestLoaderProtocol {
     }
 
     /// Helper method for evaluating the manifest.
-    // TODO: Optimizations are disabled to work around a compiler bug. Remove this attribute when the bug is fixed.
-    // See https://github.com/swiftlang/llvm-project/issues/11377 for details.
-    #if os(Windows)
-    @_optimize(none)
-    #endif
     func evaluateManifest(
         at manifestPath: AbsolutePath,
         vfsOverlayPath: AbsolutePath? = nil,

Sources/PackageRegistryCommand/PackageRegistryCommand+Publish.swift

@@ -461,11 +461,6 @@ enum PackageArchiveSigner {
 }
 
 enum PackageArchiver {
-    // TODO: Optimizations are disabled to work around a compiler bug. Remove this attribute when the bug is fixed.
-    // See https://github.com/swiftlang/llvm-project/issues/11377 for details.
-    #if os(Windows)
-    @_optimize(none)
-    #endif
     static func archive(
         packageIdentity: PackageIdentity,
         packageVersion: Version,

Sources/Workspace/Workspace+Prebuilts.swift

@@ -422,11 +422,6 @@ extension Workspace {
             return hash == checksum
         }
 
-        // TODO: Optimizations are disabled to work around a compiler bug. Remove this attribute when the bug is fixed.
-        // See https://github.com/swiftlang/llvm-project/issues/11377 for details.
-        #if os(Windows)
-        @_optimize(none)
-        #endif
         func downloadPrebuilt(
             workspace: Workspace,
             package: PrebuiltPackage,