From 82c2290e0f4ec44c56ef61f9db96093df7e8b990 Mon Sep 17 00:00:00 2001
From: Kyle Butt <kyle+llvm@iteratee.net>
Date: Tue, 28 Jun 2016 22:50:54 +0000
Subject: [PATCH] Codegen: [MBP] Add messages to asserts. NFC

llvm-svn: 274075
---
 llvm/lib/CodeGen/MachineBlockPlacement.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 9d6682e4bb1e..555fde623367 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -855,9 +855,10 @@ void MachineBlockPlacement::buildChain(
                       BlockFilter);
   BB = *std::prev(Chain.end());
   for (;;) {
-    assert(BB);
-    assert(BlockToChain[BB] == &Chain);
-    assert(*std::prev(Chain.end()) == BB);
+    assert(BB && "null block found at end of chain in loop.");
+    assert(BlockToChain[BB] == &Chain && "BlockToChainMap mis-match in loop.");
+    assert(*std::prev(Chain.end()) == BB && "BB Not found at end of chain.");
+
 
     // Look for the best viable successor if there is one to place immediately
     // after this block.