Fix detection of UBFX in case of Word32And with immediate.

TBR=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/438563002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22744 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/arm/instruction-selector-arm.cc

@@ -418,7 +418,7 @@ void InstructionSelector::VisitWord32And(Node* node) {
     uint32_t value = m.right().Value();
     uint32_t width = CompilerIntrinsics::CountSetBits(value);
     uint32_t msb = CompilerIntrinsics::CountLeadingZeros(value);
-    if (msb + width == 32) {
+    if (width != 0 && msb + width == 32) {
       ASSERT_EQ(0, CompilerIntrinsics::CountTrailingZeros(value));
       if (m.left().IsWord32Shr()) {
         Int32BinopMatcher mleft(m.left().node());