[modules] Allow emission of update records for predefined __va_list_tag.Handles the cases where old __va_list_tag is coming from a module and the newis not, needing an update record.Fixes https:
[modules] Allow emission of update records for predefined __va_list_tag.Handles the cases where old __va_list_tag is coming from a module and the newis not, needing an update record.Fixes https://llvm.org/bugs/show_bug.cgi?id=27890Patch by Cristina Cristescu, Richard Smith and me.llvm-svn: 273159
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