[gardening] Fix recently introduced typos

include/swift/SILOptimizer/Analysis/CallerAnalysis.h

@@ -78,7 +78,7 @@ class CallerAnalysis : public SILAnalysis {
 
   /// Return true if the function has a caller inside current module.
   bool existCaller(SILFunction *F) {
-    // Recompute every function in the invaldiated function list and empty the
+    // Recompute every function in the invalidated function list and empty the
     // list.
     for (auto &F : RecomputeFunctionList) {
       processFunctionCallSites(F);

lib/Parse/ParseSIL.cpp

@@ -42,7 +42,7 @@ namespace swift {
     /// the location for where the reference is.
     llvm::DenseMap<Identifier,
                    std::pair<SILFunction*, SourceLoc>> ForwardRefFns;
-    /// A list of all functions foward-declared by a sil_scope.
+    /// A list of all functions forward-declared by a sil_scope.
     std::vector<SILFunction *> PotentialZombieFns;
 
     /// A map from textual .sil scope number to SILDebugScopes.

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);

lib/SILOptimizer/IPO/FunctionSignatureOpts.cpp

@@ -48,7 +48,7 @@ STATISTIC(NumSROAArguments, "Total SROA arguments optimized");
 
 typedef SmallVector<FullApplySite, 8> ApplyList;
 //===----------------------------------------------------------------------===//
-//                     Argument and Result Optimzer
+//                     Argument and Result Optimizer
 //===----------------------------------------------------------------------===//
 
 static void