[prebuilt] Roll Clang toolchain

Test: builds
Change-Id: Ib135f4b7cd33d03626d264d0a19ced03cc59bcf3
diff --git a/prebuilt/zircon.ensure b/prebuilt/zircon.ensure
index 01bc095..1eb6ea0 100644
--- a/prebuilt/zircon.ensure
+++ b/prebuilt/zircon.ensure
@@ -33,7 +33,7 @@
 
 # Clang
 @Subdir clang
-fuchsia/clang/${platform} git_revision:a84692c158dfc3baa5d98273b881d5860bb33791
+fuchsia/clang/${platform} git_revision:1cadbeb9a6d8c7c36f3117bf1c9c7db5ce1ce6d2
 
 # GCC
 @Subdir gcc
diff --git a/prebuilt/zircon.versions b/prebuilt/zircon.versions
index f492c93..5a77706 100644
--- a/prebuilt/zircon.versions
+++ b/prebuilt/zircon.versions
@@ -1,8 +1,8 @@
 # This file is generated by scripts/update-prebuilt-versions.  DO NOT EDIT!
 # Instead, edit zircon.ensure and run the script.
 
-clang/linux-amd64 j3lISe0zJmwMB2Mpnw630ALcy9BfU8t2oU0ZOkPTPgwC
-clang/mac-amd64 ct05AaxMnVuQygEsWZimwfzkBaDK1ySR4bykqSfLzD4C
+clang/linux-amd64 bbzwcQVayR6p91wiaY4CJP5eA1H4nULIIX67mmS2td0C
+clang/mac-amd64 4LPb6_1KhVF03ghS2FKAuk5P9yqmtgpUmypdyqh1mYkC
 gcc/linux-amd64 caef03ee989e8122c002dc898ab99bd9b91d7c58
 gcc/mac-amd64 91ce4adeea757742fe77183cff9c246dd190dd97
 sysroot/linux-amd64 ae0677829357edb199c21e76b1ea31eb8ef62817