Update Clang toolchain

This update contains support for SafeStack on Fuchsia.

Change-Id: I14bf608e7134238f71e774ac024512c9fa73b033
diff --git a/linux64/toolchain.sha1 b/linux64/toolchain.sha1
index 1aa3776..f0f0262 100644
--- a/linux64/toolchain.sha1
+++ b/linux64/toolchain.sha1
@@ -1 +1 @@
-42e6dbc0ce65f1c43c2ebabf7cb41ebfc4a542f6
+69acd42c29c0ced69f64309419ebf0c2a41d94c4
diff --git a/mac/toolchain.sha1 b/mac/toolchain.sha1
index 3b919bd..808d1f5 100644
--- a/mac/toolchain.sha1
+++ b/mac/toolchain.sha1
@@ -1 +1 @@
-43a4f8cf6727692321eb7c2f850c7c10a2b7e519
+e6dc5bedb33de645bda08190808c2cf535c6cb15