[base-clang] Use llvmorg-14-init-8564-g34b903d8

Use clang version before this change: https://chromium-review.googlesource.com/c/chromium/src/+/3310960
Fixes: #6957

infra/base-images/base-clang/checkout_build_install_llvm.sh

@@ -70,11 +70,11 @@ cd clang
 LLVM_SRC=$SRC/llvm-project
 
 # For manual bumping.
-OUR_LLVM_REVISION=llvmorg-12-init-17251-g6de48655
+OUR_LLVM_REVISION==llvmorg-14-init-11072-gb1bc627e
 
 # To allow for manual downgrades. Set to 0 to use Chrome's clang version (i.e.
 # *not* force a manual downgrade). Set to 1 to force a manual downgrade.
-FORCE_OUR_REVISION=0
+FORCE_OUR_REVISION=1
 LLVM_REVISION=$(grep -Po "CLANG_REVISION = '\K([^']+)" scripts/update.py)
 
 clone_with_retries https://github.com/llvm/llvm-project.git $LLVM_SRC