[HIPIFY][fix] Fix typo and functions' string arguments

+ Fix typo with missing comma in counterNames array
+ Change std::string argument to const std::string& argument in all functions

hipify-clang/src/StringUtils.cpp

@@ -7,7 +7,7 @@ llvm::StringRef unquoteStr(llvm::StringRef s) {
   return s;
 }
 
-void removePrefixIfPresent(std::string &s, std::string prefix) {
+void removePrefixIfPresent(std::string &s, const std::string& prefix) {
   if (s.find(prefix) != 0) {
     return;
   }