[arm][arm64] Improve CountTrailingZero implementation.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 973deb86603e1d39972944b7d33acf8b6cb218a8..d494fd81620f89aa43df6d58111abf433cac9868 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1967,6 +1967,11 @@ Type* Typer::Visitor::TypeWord32Clz(Node* node) { return Type::Integral32(); }
 Type* Typer::Visitor::TypeWord32Ctz(Node* node) { return Type::Integral32(); }
 
 
+Type* Typer::Visitor::TypeWord32ReverseBits(Node* node) {
+  return Type::Integral32();
+}
+
+
 Type* Typer::Visitor::TypeWord32Popcnt(Node* node) {
   return Type::Integral32();
 }
@@ -1999,6 +2004,11 @@ Type* Typer::Visitor::TypeWord64Clz(Node* node) { return Type::Internal(); }
 Type* Typer::Visitor::TypeWord64Ctz(Node* node) { return Type::Internal(); }
 
 
+Type* Typer::Visitor::TypeWord64ReverseBits(Node* node) {
+  return Type::Internal();
+}
+
+
 Type* Typer::Visitor::TypeWord64Popcnt(Node* node) { return Type::Internal(); }