Update clang prebuilts to clang-r365631

This commit updates clang prebuilts to clang-r365631.

Test: OUT_DIR=out ./prebuilts/clang-tools/build-prebuilts.sh
Bug: 140110040
Change-Id: I02da64956feebec61c9ed188e809df7f3b246741
diff --git a/build-prebuilts.sh b/build-prebuilts.sh
index 7791408..e8ee9c3 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-r353983d
-export LLVM_RELEASE_VERSION=9.0.4
+export LLVM_PREBUILTS_VERSION=clang-r365631
+export LLVM_RELEASE_VERSION=9.0.6
 
 # FIXME: Workaround to build bionic versioner in the aosp/clang-tools branch.
 export FORCE_BUILD_LLVM_COMPONENTS=true