PPC: Remove more dead code now that legacy const is gone

src/full-codegen/ppc/full-codegen-ppc.cc

Index: src/full-codegen/ppc/full-codegen-ppc.cc
diff --git a/src/full-codegen/ppc/full-codegen-ppc.cc b/src/full-codegen/ppc/full-codegen-ppc.cc
index 8f6611805848408d1b7867eae51cf47862f532f4..8d9e49f83839740b04a8130718c8e7d3684b92a7 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -765,15 +765,8 @@ void FullCodeGenerator::VisitVariableDeclaration(
       __ mov(r5, 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(r3, Heap::kTheHoleValueRootIndex);
-      } else {
-        __ LoadSmiLiteral(r3, Smi::FromInt(0));  // Indicates no initial value.
-      }
+      DCHECK(!hole_init);
+      __ LoadSmiLiteral(r3, Smi::FromInt(0));  // Indicates no initial value.
       __ Push(r5, r3);
       __ Push(Smi::FromInt(variable->DeclarationPropertyAttributes()));
       __ CallRuntime(Runtime::kDeclareLookupSlot);