[gardening] Fix recently introduced typo: "fucntion" → "function"

Author: practicalswift

lib/SILOptimizer/Analysis/CallerAnalysis.cpp

@@ -41,7 +41,7 @@ void CallerAnalysis::processFunctionCallSites(SILFunction *F) {
         SILFunction *CalleeFn = getCallee(Apply);
         if (!CalleeFn)
           continue;
-        // Update the callee information for this fucntion.
+        // Update the callee information for this function.
         CallerAnalysisFunctionInfo &CallerInfo
                              = CallInfo.FindAndConstruct(F).second;
         CallerInfo.Callees.push_back(CalleeFn);