[asan] increase the maximal size of malloc/free stack

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@163291 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_rtl.cc b/lib/asan/asan_rtl.cc
index d2a51df..af5fbfe 100644
--- a/lib/asan/asan_rtl.cc
+++ b/lib/asan/asan_rtl.cc
@@ -62,7 +62,7 @@
 namespace __asan {
 
 // -------------------------- Flags ------------------------- {{{1
-static const int kMallocContextSize = 30;
+static const int kMallocContextSize = 64;
 
 static Flags asan_flags;