Index: lib/Transforms/Scalar/LoopUnswitch.cpp
===================================================================
--- lib/Transforms/Scalar/LoopUnswitch.cpp
+++ lib/Transforms/Scalar/LoopUnswitch.cpp
@@ -656,6 +656,7 @@
         }
       }
       // fallthrough.
+    case LLVMContext::MD_make_implicit:
     case LLVMContext::MD_dbg:
       DstInst->setMetadata(MD.first, MD.second);
     }
Index: test/Transforms/LoopUnswitch/copy-metadata.ll
===================================================================
--- /dev/null
+++ test/Transforms/LoopUnswitch/copy-metadata.ll
@@ -0,0 +1,23 @@
+; RUN: opt < %s -loop-unswitch -S < %s 2>&1 | FileCheck %s
+
+; This test checks if unswitched condition preserve make.implicit metadata.
+
+define i32 @test(i1 %cond) {
+; CHECK: br i1 %cond, label %..split_crit_edge, label %.loop_exit.split_crit_edge, !make.implicit !0
+  br label %loop_begin
+
+loop_begin:
+; CHECK: br i1 true, label %continue, label %loop_exit, !make.implicit !0
+  br i1 %cond, label %continue, label %loop_exit, !make.implicit !0
+
+continue:
+  call void @some_func()
+  br label %loop_begin
+
+loop_exit:
+  ret i32 0
+}
+
+declare void @some_func()
+
+!0 = !{}