[HIPIFY] undo apply .clangformat to HIPIFY source files

hipify-clang/src/StringUtils.h

@@ -11,4 +11,4 @@ llvm::StringRef unquoteStr(llvm::StringRef s);
 /**
  * If `s` starts with `prefix`, remove it. Otherwise, does nothing.
  */
-void removePrefixIfPresent(std::string& s, std::string prefix);
+void removePrefixIfPresent(std::string &s, std::string prefix);