Passing DISABLE_JEMALLOC=1 to valgrind_check if run locally

Summary:
Valgrind does not work well with JEMALLOC. If you run
a simple make valgrind_check, you will see lots of issues and
crashes. When precommit runs, this is taken care of. Here we
make sure valgrind_check is passed in DISABLE_JEMALLOC=1

Test Plan: Ran local valgrind_test and noticed the difference

Reviewers: IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D65379

Makefile

@@ -723,6 +723,9 @@ ubsan_crash_test:
 	COMPILE_WITH_UBSAN=1 $(MAKE) crash_test
 	$(MAKE) clean
 
+valgrind_test:
+	DISABLE_JEMALLOC=1 $(MAKE) valgrind_check
+
 valgrind_check: $(TESTS)
 	$(MAKE) DRIVER="$(VALGRIND_VER) $(VALGRIND_OPTS)" gen_parallel_tests
 	$(AM_V_GEN)if test "$(J)" != 1                                  \