Index: utils/sanitizers/ubsan_blacklist.txt
===================================================================
--- utils/sanitizers/ubsan_blacklist.txt
+++ utils/sanitizers/ubsan_blacklist.txt
@@ -10,3 +10,9 @@
 # data() on an empty vector: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59829
 src:*bits/stl_iterator.h
 src:*bits/stl_vector.h
+
+# These auto-generated functions compile down to ~50k basic blocks with inlining
+# and UBSan enabled, causing long builds builds that lead to build timeouts.
+# https://bugs.llvm.org/show_bug.cgi?id=37929
+fun:_ZN4llvm23AArch64AppleInstPrinter15printAliasInstrEPKNS_6MCInstERKNS_15MCSubtargetInfoERNS_11raw_ostreamE
+fun:_ZN4llvm18AArch64InstPrinter15printAliasInstrEPKNS_6MCInstERKNS_15MCSubtargetInfoERNS_11raw_ostreamE