clang-tidy: Enable performance-inefficient-string-concatenation

This check warns about the performance overhead arising from
concatenating strings using the operator+

Change-Id: I93a5797adb0ffc9aa1d2353bab0a5ff6773ec6d5
Signed-off-by: Pavithra Barithaya <pavithrabarithaya07@gmail.com>
diff --git a/.clang-tidy b/.clang-tidy
index e3c8194..15ad58f 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -219,6 +219,7 @@
 performance-for-range-copy,
 performance-implicit-conversion-in-loop,
 performance-inefficient-algorithm,
+performance-inefficient-string-concatenation,
 performance-inefficient-vector-operation,
 performance-move-const-arg,
 performance-move-constructor-init,