benchmark: create napi benchmark directory

Move C++ benchmark useful for NAPI to its own directory. This will
isolate the benchmark so it can be excluded from testing that applies to
all other benchmarks but not this one.

Makefile

@@ -274,13 +274,13 @@ test-valgrind: all
 test-check-deopts: all
 	$(PYTHON) tools/test.py $(PARALLEL_ARGS) --mode=$(BUILDTYPE_LOWER) --check-deopts parallel sequential
 
-benchmark/misc/function_call/build/Release/binding.node: all \
-		benchmark/misc/function_call/napi_binding.c \
-		benchmark/misc/function_call/binding.cc \
-		benchmark/misc/function_call/binding.gyp
+benchmark/napi/function_call/build/Release/binding.node: all \
+		benchmark/napi/function_call/napi_binding.c \
+		benchmark/napi/function_call/binding.cc \
+		benchmark/napi/function_call/binding.gyp
 	$(NODE) deps/npm/node_modules/node-gyp/bin/node-gyp rebuild \
 		--python="$(PYTHON)" \
-		--directory="$(shell pwd)/benchmark/misc/function_call" \
+		--directory="$(shell pwd)/benchmark/napi/function_call" \
 		--nodedir="$(shell pwd)"
 
 # Implicitly depends on $(NODE_EXE).  We don't depend on it explicitly because
@@ -1115,7 +1115,7 @@ LINT_CPP_EXCLUDE += $(wildcard test/addons-napi/??_*/*.cc test/addons-napi/??_*/
 LINT_CPP_EXCLUDE += src/tracing/trace_event.h src/tracing/trace_event_common.h
 
 LINT_CPP_FILES = $(filter-out $(LINT_CPP_EXCLUDE), $(wildcard \
-	benchmark/misc/function_call/binding.cc \
+	benchmark/napi/function_call/binding.cc \
 	src/*.c \
 	src/*.cc \
 	src/*.h \