[benchmark] Add HTTP2StateMachine benchmark

Author: Lukasa

benchmark/CMakeLists.txt

@@ -95,8 +95,7 @@ set(SWIFT_BENCH_MODULES
     single-source/Hanoi
     single-source/Hash
     single-source/Histogram
-    single-source/InsertCharacter  
-    single-source/IntegerParsing
+    single-source/HTTP2StateMachine
     single-source/Integrate
     single-source/IterateData
     single-source/Join