Update clang to clang-r428724.

Bug: 190099451
Test: none
Change-Id: I91853ca03387779fed94f69b26cd3f0dc559f539

build/arch/x86.mk

diff --git a/build/arch/x86.mk b/build/arch/x86.mk
index 43ae821..87b0666 100644
--- a/build/arch/x86.mk
+++ b/build/arch/x86.mk
@@ -9,7 +9,7 @@
          containing a path to the Android source tree. This is typically \
          provided by initializing the Android build environment.")
 endif
-export X86_TOOLS_PREFIX=$(ANDROID_BUILD_TOP)/prebuilts/clang/host/linux-x86/clang-r416183b/bin/
+export X86_TOOLS_PREFIX=$(ANDROID_BUILD_TOP)/prebuilts/clang/host/linux-x86/clang-r428724/bin/
 
 # x86 Tools ####################################################################