Upgrade to clang-r437112b.

Bug: 201432564
Test: make
Change-Id: I8dff47b3a8b8eda5955b8fe16828c4d57d6adda7

build/arch/x86.mk

diff --git a/build/arch/x86.mk b/build/arch/x86.mk
index 2d9db9c..8215f38 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=$(ANDROID_BUILD_TOP)/prebuilts/clang/host/linux-x86/clang-r437112/bin/
+export X86_TOOLS_PREFIX=$(ANDROID_BUILD_TOP)/prebuilts/clang/host/linux-x86/clang-r437112b/bin/
 
 # x86 Tools ####################################################################