We currently use a callback to handle an IL pass deleting a BB that still

has a reference to it. Unfortunately, that doesn't work for codegen passes
since we don't get notified of MBB's being deleted (the original BB stays).

Use that fact to our advantage and after printing a function, check if
any of the IL BBs corresponds to a symbol that was not printed. This fixes
pr11202.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144674 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/X86/pr11202.ll

@@ -0,0 +1,19 @@
+; RUN: llc < %s -mtriple=x86_64-pc-linux | FileCheck %s
+
+@bb = constant [1 x i8*] [i8* blockaddress(@main, %l2)]
+
+define void @main() {
+entry:
+  br label %l1
+
+l1:                                               ; preds = %l2, %entry
+  %a = zext i1 false to i32
+  br label %l2
+
+l2:                                               ; preds = %l1
+  %b = zext i1 false to i32
+  br label %l1
+}
+
+; CHECK: .Ltmp1:                                 # Address of block that was removed by CodeGen
+; CHECK: .quad	.Ltmp1