Fill in two missing functions for Embedded Swift

`swift_coroFrameAlloc` is needed by `_read`/`_modify` accessors

`swift_deallocUninitializedObject` which I believe is needed for failable class initializers

Resolves rdar://157028375
Resolves rdar://157276375

Author: tbkka

stdlib/public/core/EmbeddedRuntime.swift

@@ -149,6 +149,13 @@ func alignedAlloc(size: Int, alignment: Int) -> UnsafeMutableRawPointer? {
   return unsafe r
 }
 
+@_cdecl("swift_coroFrameAlloc")
+public func swift_coroFrameAlloc(_ size: Int, _ type: UInt) -> UnsafeMutableRawPointer? {
+  return unsafe alignedAlloc(
+    size: size,
+    alignment: _swift_MinAllocationAlignment)
+}
+
 @_cdecl("swift_slowAlloc")
 public func swift_slowAlloc(_ size: Int, _ alignMask: Int) -> UnsafeMutableRawPointer? {
   let alignment: Int
@@ -178,6 +185,14 @@ func swift_allocObject(metadata: UnsafeMutablePointer<ClassMetadata>, requiredSi
   return unsafe object
 }
 
+@_cdecl("swift_deallocUninitializedObject")
+public func swift_deallocUninitializedObject(object: Builtin.RawPointer, allocatedSize: Int, allocatedAlignMask: Int) {
+  unsafe swift_deallocObject(
+    object: UnsafeMutablePointer<HeapObject>(object),
+    allocatedSize: allocatedSize,
+    allocatedAlignMask: allocatedAlignMask)
+}
+
 @_cdecl("swift_deallocObject")
 public func swift_deallocObject(object: Builtin.RawPointer, allocatedSize: Int, allocatedAlignMask: Int) {
   unsafe swift_deallocObject(object: UnsafeMutablePointer<HeapObject>(object), allocatedSize: allocatedSize, allocatedAlignMask: allocatedAlignMask)