Cherry-pick llvm-project d84450bc5123. (#14622)

https://reviews.llvm.org/D156008

Fixes a downstream bug.
diff --git a/third_party/llvm-project b/third_party/llvm-project
index aed546c..82ca6e9 160000
--- a/third_party/llvm-project
+++ b/third_party/llvm-project
@@ -1 +1 @@
-Subproject commit aed546c45cbc0c5cd155b060d00494a87c7501ef
+Subproject commit 82ca6e95476b13f6c2572fb7d9397e5db8eeb510