Merge pull request swiftlang#15130 from gottesmm/pr-cf8e87dbd3b1ae0cb9986335bc37e08b16cacf58

[+0-normal-args] Make sure to use |= when enabling +0 in sil-opt.

Author: gottesmm

tools/sil-opt/SILOpt.cpp

@@ -326,7 +326,7 @@ int main(int argc, char **argv) {
   SILOpts.EnableSILOwnership = EnableSILOwnershipOpt;
   SILOpts.AssumeUnqualifiedOwnershipWhenParsing =
     AssumeUnqualifiedOwnershipWhenParsing;
-  SILOpts.EnableGuaranteedNormalArguments =
+  SILOpts.EnableGuaranteedNormalArguments |=
     EnableGuaranteedNormalArguments;
 
   SILOpts.VerifyExclusivity = VerifyExclusivity;