Make bugpoint dead-argument-hacking actually work, and actually test it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105551 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/DeadArgumentElimination.cpp

@@ -120,9 +120,14 @@ namespace {
 
     typedef SmallVector<RetOrArg, 5> UseVector;
 
+  protected:
+    // DAH uses this to specify a different ID.
+    explicit DAE(void *ID) : ModulePass(ID) {}
+
   public:
     static char ID; // Pass identification, replacement for typeid
     DAE() : ModulePass(&ID) {}
+
     bool runOnModule(Module &M);
 
     virtual bool ShouldHackArguments() const { return false; }
@@ -155,6 +160,8 @@ namespace {
   /// by bugpoint.
   struct DAH : public DAE {
     static char ID;
+    DAH() : DAE(&ID) {}
+
     virtual bool ShouldHackArguments() const { return true; }
   };
 }

test/BugPoint/remove_arguments_test.ll

@@ -1,10 +1,12 @@
 ; RUN: bugpoint %s -output-prefix %t -bugpoint-crashcalls -silence-passes
+; RUN: llvm-dis remove_arguments_test.ll.tmp-reduced-simplified.bc -o - | FileCheck %s
 
 ; Test to make sure that arguments are removed from the function if they are 
 ; unnecessary.
 
 declare i32 @test2()
 
+; CHECK: define void @test() {
 define i32 @test(i32 %A, i32 %B, float %C) {
 	call i32 @test2()
 	ret i32 %1