core: Backport compatible MALLOC_DEBUG changes.

* Add support for MALLOC_DEBUG and DEBUG_CHAOS to be used together.
* Add utils/astmm.c to .gitignore.
* Fix MALLOC_DEBUG variant of __ast_vasprintf.  This function called
  va_end(ap) upon allocation failure.  This is incorrect since ap is
  passed as an argument.

Change-Id: I9f27ced4ce3cbe4b39547a67f994fdff491978c0

build_tools/cflags.xml

@@ -78,11 +78,9 @@
 			<support_level>extended</support_level>
 		</member>
 		<member name="MALLOC_DEBUG" displayname="Keep Track of Memory Allocations">
-			<conflict>DEBUG_CHAOS</conflict>
 			<support_level>core</support_level>
 		</member>
 		<member name="DEBUG_CHAOS" displayname="Randomly FAIL memory allocations or other operations">
-			<conflict>MALLOC_DEBUG</conflict>
 			<support_level>core</support_level>
 		</member>
 		<member name="ADDRESS_SANITIZER" displayname="Address Sanitizer">

main/astmm.c

@@ -227,6 +227,8 @@ static void *__ast_alloc_region(size_t size, const enum func_type which, const c
 	unsigned int *fence;
 	int hash;
 
+	DEBUG_CHAOS_RETURN(DEBUG_CHAOS_ALLOC_CHANCE, NULL);
+
 	if (!(reg = malloc(size + sizeof(*reg) + sizeof(*fence)))) {
 		astmm_log("Memory Allocation Failure - '%d' bytes at %s %s() line %d\n",
 			(int) size, file, func, lineno);
@@ -664,7 +666,6 @@ int __ast_vasprintf(char **strp, const char *fmt, va_list ap, const char *file,
 	size = vsnprintf(&s, 1, fmt, ap2);
 	va_end(ap2);
 	if (!(*strp = __ast_alloc_region(size + 1, FUNC_VASPRINTF, file, lineno, func, 0))) {
-		va_end(ap);
 		return -1;
 	}
 	vsnprintf(*strp, size + 1, fmt, ap);

utils/.gitignore

@@ -3,6 +3,7 @@ aelparse
 aelparse.c
 ast_expr2.c
 ast_expr2f.c
+astmm.c
 astman
 astcanary
 astdb2bdb