Auto upgrade bitcode to new vararg representation for coro.id.retcon.once intrinsic #10324
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The signature of coro.id.retcon.once intrinsic was modified in #10015 with an extra vararg. This commit adds an auto upgrader to LLVM in order to be compatible with compilers generating old bitcode (intrinsic without the vararg).
rdar://147426562
(cherry picked from commit bb25095)