[AutoDiff] NFC: Highlights original function name in diagnostic

[vguerra]

Small follow up of PR-36128 to be consistent with other diagnostics emitted when type-checking @derivative and @transpose attributes.

[rxwei]

@swift-ci please test and merge

[vguerra]

The failure for Swift Test macOS Platform seems unrelated to this change:

20:55:34 FATAL: Unable to delete script file /var/folders/_8/79jmzf2142z2xydc_01btlx00000gn/T/jenkins7093808389191469028.sh
20:55:34 java.io.EOFException
20:55:34 at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2759)
20:55:34 at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3234)
20:55:34 at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:913)
20:55:34 at java.io.ObjectInputStream.(ObjectInputStream.java:375)
20:55:34 at hudson.remoting.ObjectInputStreamEx.(ObjectInputStreamEx.java:49)
20:55:34 at hudson.remoting.Command.readFrom(Command.java:142)
20:55:34 at hudson.remoting.Command.readFrom(Command.java:128)
20:55:34 at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:35)
20:55:34 at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:63)
20:55:34 Caused: java.io.IOException: Unexpected termination of the channel
20:55:34 at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:77)
20:55:34 Caused: hudson.remoting.ChannelClosedException: Channel "hudson.remoting.Channel@4c22fd22:macOS-44": Remote call on macOS-44 failed. The channel is closing down or has closed down
20:55:34 at hudson.remoting.Channel.call(Channel.java:991)

could you please comment again to trigger again the tests?

[rxwei]

@swift-ci please test macos