From 0c4ad1fda667a955df11aba294098153a1a1ba44 Mon Sep 17 00:00:00 2001
From: "Felix S. Klock II" <pnkfelix@pnkfx.org>
Date: Mon, 30 Mar 2020 14:10:39 -0400
Subject: [PATCH] Fix #69841 by updating LLVM submodule. Includes regression
 test for issue 69841.

---
 src/llvm-project                  |  2 +-
 src/test/ui/issues/issue-69841.rs | 30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 src/test/ui/issues/issue-69841.rs

diff --git a/src/llvm-project b/src/llvm-project
index 992e608cfc5d1..130721d6f4e6c 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 992e608cfc5d1c126a23c640222fd396a3bdeb9f
+Subproject commit 130721d6f4e6cba3b910ccdf5e0aa62b9dffc95f
diff --git a/src/test/ui/issues/issue-69841.rs b/src/test/ui/issues/issue-69841.rs
new file mode 100644
index 0000000000000..942b99b742bc6
--- /dev/null
+++ b/src/test/ui/issues/issue-69841.rs
@@ -0,0 +1,30 @@
+// This is a regression test for issue rust-lang/rust#69841, which exposed an
+// LLVM bug which needed a fix to be backported.
+
+// run-pass
+
+fn main() {
+    let buffer = [49u8, 10];
+    let mut a : u64 = 0;
+    'read: loop {
+        for c in &buffer {
+            match c {
+                48..=57 => {
+                    a*= 10;
+                    a+= *c as u64 - 48;
+                }
+                10 => {
+                    break 'read;
+                }
+                _ => {
+                    unsafe { std::hint::unreachable_unchecked() };
+                }
+            }
+        }
+    }
+    if a == 1 {
+        println!("What did you expect?");
+    } else {
+        panic!("this should be unreachable.");
+    }
+}