[turbofan] Turn Math.clz32 into an inlinable builtin.

test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc

Index: test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
diff --git a/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc b/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
index a93b3fcafa21ae15fc7a666f71ef5174693703e6..9138ab2ca671503f3f43ece746ead4c028533c74 100644
--- a/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
+++ b/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
@@ -11,9 +11,9 @@ namespace compiler {
 namespace {
 
 // Immediates (random subset).
-static const int32_t kImmediates[] = {
-    kMinInt, -42, -1, 0,  1,  2,    3,      4,          5,
-    6,       7,   8,  16, 42, 0xff, 0xffff, 0x0f0f0f0f, kMaxInt};
+const int32_t kImmediates[] = {kMinInt, -42, -1,   0,      1,          2,
+                               3,       4,   5,    6,      7,          8,
+                               16,      42,  0xff, 0xffff, 0x0f0f0f0f, kMaxInt};
 
 }  // namespace
 
@@ -689,6 +689,21 @@ TEST_F(InstructionSelectorTest, Uint32LessThanWithLoadAndLoadStackPointer) {
   EXPECT_EQ(kUnsignedGreaterThan, s[0]->flags_condition());
 }
 
+
+TEST_F(InstructionSelectorTest, Word32Clz) {
+  StreamBuilder m(this, kMachUint32, kMachUint32);
+  Node* const p0 = m.Parameter(0);
+  Node* const n = m.Word32Clz(p0);
+  m.Return(n);
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kIA32Lzcnt, s[0]->arch_opcode());
+  ASSERT_EQ(1U, s[0]->InputCount());
+  EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
+  ASSERT_EQ(1U, s[0]->OutputCount());
+  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8