PPC: Fix "[compiler] Remove the special case "prototype" load in class literals."

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1675383002

Cr-Commit-Position: refs/heads/master@{#33831}

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

@@ -2237,6 +2237,7 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
     ObjectLiteral::Property* property = lit->properties()->at(i);
     Expression* value = property->value();
 
+    Register scratch = r4;
     if (property->is_static()) {
       __ LoadP(scratch, MemOperand(sp, kPointerSize));  // constructor
     } else {

src/ppc/macro-assembler-ppc.h

@@ -163,6 +163,7 @@ class MacroAssembler : public Assembler {
   }
 
   // Register move. May do nothing if the registers are identical.
+  void Move(Register dst, Smi* smi) { LoadSmiLiteral(dst, smi); }
   void Move(Register dst, Handle<Object> value);
   void Move(Register dst, Register src, Condition cond = al);
   void Move(DoubleRegister dst, DoubleRegister src);