Switch to clang-4393122.

Bug: http://b/62580008
Test: https://goto.google.com/clang-4393122-testing
Change-Id: I287bd58cb522ac78285da4778818133022b2abc8
diff --git a/core/clang/versions.mk b/core/clang/versions.mk
index c2473cd..f3a206a 100644
--- a/core/clang/versions.mk
+++ b/core/clang/versions.mk
@@ -1,4 +1,4 @@
 ## Clang/LLVM release versions.
 
-LLVM_PREBUILTS_VERSION ?= clang-4053586
+LLVM_PREBUILTS_VERSION ?= clang-4393122
 LLVM_PREBUILTS_BASE ?= prebuilts/clang/host