Add CLZ instruction to the ARM integrated assembler.

src/IceInstARM32.cpp

Index: src/IceInstARM32.cpp
diff --git a/src/IceInstARM32.cpp b/src/IceInstARM32.cpp
index 07b4429bd2841d9a7b11c2f4e878794c1dd7b2d9..92b70c2f75db10342355b5710e5bd5a6d9314f1e 100644
--- a/src/IceInstARM32.cpp
+++ b/src/IceInstARM32.cpp
@@ -1250,6 +1250,14 @@ template <> void InstARM32Movt::emitIAS(const Cfg *Func) const {
     emitUsingTextFixup(Func);
 }
 
+template <> void InstARM32Clz::emitIAS(const Cfg *Func) const {
+  assert(getSrcSize() == 1);
+  auto *Asm = Func->getAssembler<ARM32::AssemblerARM32>();
+  Asm->clz(getDest(), getSrc(0), getPredicate());
+  if (Asm->needsTextFixup())
+    emitUsingTextFixup(Func);
+}
+
 template <> void InstARM32Mvn::emitIAS(const Cfg *Func) const {
   assert(getSrcSize() == 1);
   auto *Asm = Func->getAssembler<ARM32::AssemblerARM32>();