tests: make SANITIZE=address imply TEST_NO_MALLOC_CHECK

As the address sanitizer checks for a superset of the issues detected
by setting MALLOC_CHECK_ (which tries to detect things like double
frees and off-by-one errors) there is no need to set the latter when
compiling with -fsanitize=address.

This fixes a regression introduced by 131b94a10a ("test-lib.sh: Use
GLIBC_TUNABLES instead of MALLOC_CHECK_ on glibc >= 2.34", 2022-03-04)
which causes all the tests to fail with the message

    ASan runtime does not come first in initial library list;
    you should either link runtime to your application or
    manually preload it with LD_PRELOAD.

when git is compiled with SANITIZE=address on systems with glibc >=
2.34. I have tested SANITIZE=leak and SANITIZE=undefined and they do
not suffer from this regression so the fix in this patch should be
sufficient.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -1221,8 +1221,9 @@ PTHREAD_CFLAGS =
 SPARSE_FLAGS ?= -std=gnu99
 SP_EXTRA_FLAGS = -Wno-universal-initializer
 
-# For informing GIT-BUILD-OPTIONS of the SANITIZE=leak target
+# For informing GIT-BUILD-OPTIONS of the SANITIZE=leak,address targets
 SANITIZE_LEAK =
+SANITIZE_ADDRESS =
 
 # For the 'coccicheck' target; setting SPATCH_BATCH_SIZE higher will
 # usually result in less CPU usage at the cost of higher peak memory.
@@ -1272,6 +1273,7 @@ SANITIZE_LEAK = YesCompiledWithIt
 endif
 ifneq ($(filter address,$(SANITIZERS)),)
 NO_REGEX = NeededForASAN
+SANITIZE_ADDRESS = YesCompiledWithIt
 endif
 endif
 
@@ -2853,6 +2855,7 @@ GIT-BUILD-OPTIONS: FORCE
 	@echo PAGER_ENV=\''$(subst ','\'',$(subst ','\'',$(PAGER_ENV)))'\' >>$@+
 	@echo DC_SHA1=\''$(subst ','\'',$(subst ','\'',$(DC_SHA1)))'\' >>$@+
 	@echo SANITIZE_LEAK=\''$(subst ','\'',$(subst ','\'',$(SANITIZE_LEAK)))'\' >>$@+
+	@echo SANITIZE_ADDRESS=\''$(subst ','\'',$(subst ','\'',$(SANITIZE_ADDRESS)))'\' >>$@+
 	@echo X=\'$(X)\' >>$@+
 ifdef TEST_OUTPUT_DIRECTORY
 	@echo TEST_OUTPUT_DIRECTORY=\''$(subst ','\'',$(subst ','\'',$(TEST_OUTPUT_DIRECTORY)))'\' >>$@+

t/test-lib.sh

@@ -503,9 +503,10 @@ case $GIT_TEST_FSYNC in
 	;;
 esac
 
-# Add libc MALLOC and MALLOC_PERTURB test
+# Add libc MALLOC and MALLOC_PERTURB test only if we are not executing
-# only if we are not executing the test with valgrind
+# the test with valgrind and have not compiled with SANITIZE=address.
 if test -n "$valgrind" ||
+   test -n "$SANITIZE_ADDRESS" ||
    test -n "$TEST_NO_MALLOC_CHECK"
 then
 	setup_malloc_check () {