[ASan] Fix two tests on FreeBSD: alloca.h is missing there.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@243800 91177308-0d34-0410-b5e6-96231b3b80d8

Author: vonosmas

test/asan/TestCases/alloca_loop_unpoisoning.cc

@@ -6,8 +6,8 @@
 // This testcase checks that allocas and VLAs inside loop are correctly unpoisoned.
 
 #include <assert.h>
-#include <alloca.h>
 #include <stdint.h>
+#include <stdlib.h>
 #include "sanitizer/asan_interface.h"
 
 void *top, *bot;

test/asan/TestCases/alloca_vla_interact.cc

@@ -7,8 +7,8 @@
 // This testcase checks correct interaction between VLAs and allocas.
 
 #include <assert.h>
-#include <alloca.h>
 #include <stdint.h>
+#include <stdlib.h>
 #include "sanitizer/asan_interface.h"
 
 #define RZ 32