[stdlib] Temporarily reinstate original ObjectIdentifier.init as public

The new generalization sometimes causes a runtime hang that I’m still analyzing. The original declaration should be considered more specific for preexisting use cases, eliminating the source compatibility issue.

Author: lorentey

stdlib/public/core/ObjectIdentifier.swift

@@ -66,9 +66,10 @@ public struct ObjectIdentifier: Sendable {
     self._value = unsafe unsafeBitCast(x, to: Builtin.RawPointer.self)
   }
 
-  @_spi(SwiftStdlibLegacyABI) @available(swift, obsoleted: 1)
-  @usableFromInline
-  internal init(_ x: Any.Type) {
+  @inlinable
+  public init(_ x: Any.Type) {
+    // FIXME: This ought to be obsoleted in favor of the generalized overload
+    // above. Unfortunately, that one sometimes causes a runtime hang.
     self._value = unsafe unsafeBitCast(x, to: Builtin.RawPointer.self)
   }
 }

test/api-digester/stability-stdlib-abi-without-asserts.test

@@ -853,7 +853,6 @@ Accessor UnsafeMutableBufferPointer.indices.Get() has generic signature change f
 Accessor UnsafeMutableBufferPointer.indices.Get() has mangled name changing from 'Swift.UnsafeMutableBufferPointer.indices.getter : Swift.Range<Swift.Int>' to '(extension in Swift):Swift.UnsafeMutableBufferPointer< where A: ~Swift.Copyable>.indices.getter : Swift.Range<Swift.Int>'
 Var UnsafeMutableBufferPointer.indices has mangled name changing from 'Swift.UnsafeMutableBufferPointer.indices : Swift.Range<Swift.Int>' to '(extension in Swift):Swift.UnsafeMutableBufferPointer< where A: ~Swift.Copyable>.indices : Swift.Range<Swift.Int>'
 Var UnsafeMutableBufferPointer.indices is now with @_preInverseGenerics
-Constructor ObjectIdentifier.init(_:) has been removed
 Func !=(_:_:) has been removed
 Func ==(_:_:) has been removed
 Func type(of:) has been removed