llvm: fix lowerDeclRefValue for extern function aliases

Same as 0577069af5f5deb859762725736537d60c324453 for extern functions.

Closes  #14610
0328c9cbebVeikka Tuominen committed on 2/11/2023, 12:36:54 PMparent8127a27
1 file changedLine totals unavailable