[TF] Fix SwiftReflectionTest build.
Temporary patch to fix SwiftReflectionTest build after 014918c0cab399fc532e45cf725c3c9c0c425aa6:
```
swift/stdlib/private/SwiftReflectionTest/SwiftReflectionTest.swift:141:10: error: cannot find '_getMetadataSection' in scope
return _getMetadataSection(UInt(i)).map { rawPointer in
^~~~~~~~~~~~~~~~~~~
swift/stdlib/private/SwiftReflectionTest/SwiftReflectionTest.swift:155:17: error: cannot find '_getMetadataSectionCount' in scope
return UInt32(_getMetadataSectionCount())
^~~~~~~~~~~~~~~~~~~~~~~~
```
Robust fix coming later.