Update to use clang-r344140b.

Bug: http://b/119270185
Test: N/A
Change-Id: If4bc67d666797710008fe31f6c2d4c7a2527525a
diff --git a/build-prebuilts.sh b/build-prebuilts.sh
index 127f232..8362a63 100755
--- a/build-prebuilts.sh
+++ b/build-prebuilts.sh
@@ -15,8 +15,8 @@
 # limitations under the License.
 
 export LLVM_BUILD_HOST_TOOLS=true
-export LLVM_PREBUILTS_VERSION=clang-r344140
-export LLVM_RELEASE_VERSION=8.0.3
+export LLVM_PREBUILTS_VERSION=clang-r344140b
+export LLVM_RELEASE_VERSION=8.0.4
 
 # FIXME: Workaround to build bionic versioner in the aosp/clang-tools branch.
 export FORCE_BUILD_LLVM_COMPONENTS=true