Pull in static TLS DR bug fixes (#2373)

Updates DR to 39dc18f5 to pull in solutions to
DynamoRIO/dynamorio#4136 to fix crashes with static TLS use in
applications.

dynamorio

diff --git a/dynamorio b/dynamorio
index 312d24d..39dc18f 160000
--- a/dynamorio
+++ b/dynamorio
@@ -1 +1 @@
-Subproject commit 312d24d3118942e25bebd570c0c153b522295d4b
+Subproject commit 39dc18f50375055c5c4b81ca92880bee03daaf0b