Fix rdar://7879828 - crash in CallGraph, a self host issue.

Arg promotion was deleting call graph nodes that still had references
from the 'indirect' CGN.  Like the inliner, it should only delete the
function if all references are gone.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101845 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/ArgumentPromotion/crash.ll

@@ -0,0 +1,38 @@
+; rdar://7879828
+; RUN: opt -inline -argpromotion %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.0.0"
+
+define void @foo() {
+  invoke void @foo2()
+          to label %if.end432 unwind label %for.end520 
+
+if.end432:  
+  unreachable
+
+for.end520: 
+  unreachable
+}
+
+define internal  void @foo2() ssp {
+  %call7 = call fastcc i8* @foo3(i1 (i8*)* @foo4)
+  %call58 = call fastcc i8* @foo3(i1 (i8*)* @foo5)
+  unreachable
+}
+
+define internal fastcc i8* @foo3(i1 (i8*)* %Pred) {
+entry:
+  unreachable
+}
+
+define internal i1 @foo4(i8* %O) nounwind {
+entry:
+  %call = call zeroext i1 @foo5(i8* %O) ; <i1> [#uses=0]
+  unreachable
+}
+
+define internal i1 @foo5(i8* %O) nounwind {
+entry:
+  ret i1 undef
+}
+