Fix SCEVExpander assert during LSR: "argument of incompatible type".

Just because we're dealing with a GEP doesn't mean we can assert the
SCEV has a pointer type. The fix is simply to ignore the SCEV pointer
type, which we really didn't need.
Fixes PR11138 webkit crash.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142058 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/LoopStrengthReduce/2011-10-14-IntPtr.ll

@@ -0,0 +1,27 @@
+; RUN: opt -loop-reduce -S < %s | FileCheck %s
+;
+; Test SCEVExpander reusing a phi->gep->phi IV when SCEV "wrongly"
+; reports the expression as an IntegerTy.
+
+target triple = "x86_64-apple-darwin"
+
+; CHECK: @test
+; CHECK: phi
+; CHECK-NOT: phi
+define void @test(i32 %rowStride) ssp align 2 {
+entry:
+  %cond = select i1 undef, i32 %rowStride, i32 4
+  br label %for.end
+
+for.end.critedge:                                 ; preds = %for.end
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.critedge, %entry
+  br i1 undef, label %for.body83, label %for.end.critedge
+
+for.body83:                                       ; preds = %for.body83, %for.end
+  %ptr.0157 = phi i8* [ %add.ptr96, %for.body83 ], [ null, %for.end ]
+  store i8 undef, i8* %ptr.0157, align 1
+  %add.ptr96 = getelementptr inbounds i8* %ptr.0157, i32 %cond
+  br label %for.body83
+}