Revert "Switch to clang-3625443."

This reverts commit 296af27303646fc7cd9e59f63d968f8513b79a8f.

Reason for revert: <INSERT REASONING HERE>

Change-Id: I524c2c89004c79352bf2be3727c7ddcceca9b2e7
diff --git a/core/clang/versions.mk b/core/clang/versions.mk
index ab0e409..d9c8aab 100644
--- a/core/clang/versions.mk
+++ b/core/clang/versions.mk
@@ -1,3 +1,3 @@
 ## Clang/LLVM release versions.
 
-LLVM_PREBUILTS_VERSION ?= clang-3625443
+LLVM_PREBUILTS_VERSION ?= clang-3289846