Revert r191834 until we measure the effect of this benchmarks and maybe find a better way to fix it

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192121 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/GlobalOpt/metadata.ll

@@ -0,0 +1,26 @@
+; RUN: opt -S -globalopt < %s | FileCheck %s
+
+; PR6112 - When globalopt does RAUW(@G, %G), the metadata reference should drop
+; to null.  Function local metadata that references @G from a different function
+; to that containing %G should likewise drop to null.
+@G = internal global i8** null
+
+define i32 @main(i32 %argc, i8** %argv) {
+; CHECK-LABEL: @main(
+; CHECK: %G = alloca
+  store i8** %argv, i8*** @G
+  ret i32 0
+}
+
+define void @foo(i32 %x) {
+  call void @llvm.foo(metadata !{i8*** @G, i32 %x})
+; CHECK: call void @llvm.foo(metadata !{null, i32 %x})
+  ret void
+}
+
+declare void @llvm.foo(metadata) nounwind readnone
+
+!named = !{!0}
+
+!0 = metadata !{i8*** @G}
+; CHECK: !0 = metadata !{null}