[ASan] allow calls to memmove during rtl initialization

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@158201 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_interceptors.cc b/lib/asan/asan_interceptors.cc
index 22f6c31..3ffb559 100644
--- a/lib/asan/asan_interceptors.cc
+++ b/lib/asan/asan_interceptors.cc
@@ -439,6 +439,9 @@
 }
 
 INTERCEPTOR(void*, memmove, void *to, const void *from, uptr size) {
+  if (asan_init_is_running) {
+    return REAL(memmove)(to, from, size);
+  }
   ENSURE_ASAN_INITED();
   if (FLAG_replace_intrin) {
     ASAN_WRITE_RANGE(from, size);