[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 ae79a73b4622e705d978c3a77be9cad1b522a684..f3c179cd75a04ddaacbc97805120a6e63bf49a7d 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1960,6 +1960,11 @@ 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();
 }
@@ -1992,6 +1997,11 @@ 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(); }