Implement UXTB and UXTH in the ARM integerated assembler.

src/IceInstARM32.cpp

Index: src/IceInstARM32.cpp
diff --git a/src/IceInstARM32.cpp b/src/IceInstARM32.cpp
index b7eae71189fca27f73c69235788c1352dcbeb38c..7363617c80e672d561a84cd371653dd4eb268951 100644
--- a/src/IceInstARM32.cpp
+++ b/src/IceInstARM32.cpp
@@ -1077,6 +1077,14 @@ template <> void InstARM32Movt::emitIAS(const Cfg *Func) const {
     emitUsingTextFixup(Func);
 }
 
+template <> void InstARM32Uxt::emitIAS(const Cfg *Func) const {
+  assert(getSrcSize() == 1);
+  auto *Asm = Func->getAssembler<ARM32::AssemblerARM32>();
+  Asm->uxt(getDest(), getSrc(0), getPredicate());
+  if (Asm->needsTextFixup())
+    emitUsingTextFixup(Func);
+}
+
 void InstARM32Pop::emit(const Cfg *Func) const {
   // TODO(jpp): Improve FP register save/restore.
   if (!BuildDefs::dump())