Dropping shadowed variable.

Accidentally introduced in:
https://crrev.com/da632baac7e28d370d9893676c8d1d3e901a4400
crrev.com/1652963004

BUG= https://code.google.com/p/v8/issues/detail?id=4203
BUG=427616
TEST=test-asm-validator
R=brucedawson@chromium.org,aseemgarg@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1795993002

Cr-Commit-Position: refs/heads/master@{#34737}

src/typing-asm.cc

@@ -956,7 +956,6 @@ void AsmTyper::VisitCall(Call* expr) {
     ZoneList<Expression*>* args = expr->arguments();
     if (Type::Any()->Is(result_type)) {
       // For foreign calls.
-      ZoneList<Expression*>* args = expr->arguments();
       for (int i = 0; i < args->length(); ++i) {
         Expression* arg = args->at(i);
         RECURSE(VisitWithExpectation(