[roll third_party/pigweed] roll: clang-next

From: git_revision:b1d2e8510b58893e58558ffdf3f8ba29c1e25e5a
To: git_revision:0f61051f541a5b8cfce25c84262dfdbadb9ca688
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/205290
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 678e85847484879..84084ec60dd5d15
Roller-URL: https://ci.chromium.org/b/8750056285476097249
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I5507f98c7405bac344c4d1bc9dc5cb8c8ea84522
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/205350
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 678e858..84084ec 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 678e85847484879c1844641e9be89473ff66367e
+Subproject commit 84084ec60dd5d15e0732bc5ba32190a047550ae2