Remove more dead code now that legacy const is gone

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index 2cd262418303724f5242ffbf51d4870261a382a1..da7f8a5d23044cca562df22e672d80a662a10fcd 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -800,17 +800,9 @@ void FullCodeGenerator::VisitVariableDeclaration(
       __ Mov(x2, Operand(variable->name()));
       // Declaration nodes are always introduced in one of four modes.
       DCHECK(IsDeclaredVariableMode(mode));
-      // Push initial value, if any.
-      // Note: For variables we must not push an initial value (such as
-      // 'undefined') because we may have a (legal) redeclaration and we
-      // must not destroy the current value.
-      if (hole_init) {
-        __ LoadRoot(x0, Heap::kTheHoleValueRootIndex);
-        __ Push(x2, x0);
-      } else {
-        // Pushing 0 (xzr) indicates no initial value.
-        __ Push(x2, xzr);
-      }
+      DCHECK(!hole_init);
+      // Pushing 0 (xzr) indicates no initial value.
+      __ Push(x2, xzr);
       __ Push(Smi::FromInt(variable->DeclarationPropertyAttributes()));
       __ CallRuntime(Runtime::kDeclareLookupSlot);
       PrepareForBailoutForId(proxy->id(), BailoutState::NO_REGISTERS);