AllocaInst can't return a null pointer. Fixes missed optimization

opportunity pointed out by Andrew Lewycky.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31115 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/PredicateSimplifier/predsimplify.ll

@@ -1,5 +1,5 @@
 ; RUN: llvm-as < %s | opt -predsimplify -instcombine -simplifycfg | llvm-dis | grep -v declare | not grep fail &&
-; RUN: llvm-as < %s | opt -predsimplify -instcombine -simplifycfg | llvm-dis | grep -v declare | grep pass | wc -l | grep 3
+; RUN: llvm-as < %s | opt -predsimplify -instcombine -simplifycfg | llvm-dis | grep -v declare | grep -c pass | grep 4
 
 void %test1(int %x) {
 entry:
@@ -149,6 +149,21 @@ return:
   ret void
 }
 
+void %test10()  {
+entry:
+  %A = alloca int
+  %B = seteq int* %A, null
+  br bool %B, label %cond_true, label %cond_false
+
+cond_true:
+  call void (...)* %fail ( )
+  ret void
+
+cond_false:
+  call void (...)* %pass ( )
+  ret void
+}
+
 void %switch1(int %x) {
 entry:
   %A = seteq int %x, 10