Make sure IPSCCP never marks a tracked call as overdefined in SCCPSolver::ResolvedUndefsIn. If we do, we can end up in a situation where a function is resolved to return a constant, but the caller is marked overdefined, which confuses the code later.

<rdar://problem/9956541> (again).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140210 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/SCCP/ipsccp-basic.ll

@@ -209,3 +209,21 @@ entry:
 }
 
 declare i32 @__gxx_personality_v0(...)
+
+;;======================== test10
+
+define i32 @test10a() nounwind {
+entry:
+  %call = call i32 @test10b(i32 undef)
+  ret i32 %call
+; CHECK: define i32 @test10a
+; CHECK: ret i32 0
+}
+
+define internal i32 @test10b(i32 %x) nounwind {
+entry:
+  %r = and i32 %x, 1
+  ret i32 %r
+; CHECK: define internal i32 @test10b
+; CHECK: ret i32 undef
+}