[ignition] Add bytecodes for loads/stores in the current context

test/cctest/interpreter/bytecode_expectations/ClassDeclarations.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: yes
 
 ---
 snippet: "
   class Person {
@@ skipping 104 matching lines @@
 snippet: "
   var n0 = 'a';
   var n1 = 'b';
   class N {
     [n0]() { return n0; }
     static [n1]() { return n1; }
   }
 "
 frame size: 11
 parameter count: 1
-bytecode array length: 128
+bytecode array length: 120
 bytecodes: [
                 B(CreateFunctionContext), U8(2),
                 B(PushContext), R(3),
                 B(LdaTheHole),
                 B(Star), R(2),
   /*   30 E> */ B(StackCheck),
   /*   43 S> */ B(LdaConstant), U8(0),
-  /*   43 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   43 E> */ B(StaCurrentContextSlot), U8(4),
   /*   57 S> */ B(LdaConstant), U8(1),
-  /*   57 E> */ B(StaContextSlot), R(context), U8(5), U8(0),
+  /*   57 E> */ B(StaCurrentContextSlot), U8(5),
                 B(LdaTheHole),
                 B(Star), R(0),
   /*   62 S> */ B(LdaTheHole),
                 B(Star), R(4),
                 B(CreateClosure), U8(2), U8(2),
                 B(Star), R(5),
                 B(LdaSmi), U8(62),
                 B(Star), R(6),
                 B(Wide), B(LdaSmi), U16(128),
                 B(Star), R(7),
                 B(CallRuntime), U16(Runtime::kDefineClass), R(4), U8(4),
                 B(Star), R(4),
                 B(LdrNamedProperty), R(4), U8(3), U8(2), R(5),
-  /*   75 E> */ B(LdaContextSlot), R(context), U8(4), U8(0),
+  /*   75 E> */ B(LdaCurrentContextSlot), U8(4),
                 B(ToName), R(7),
                 B(CreateClosure), U8(4), U8(2),
                 B(Star), R(8),
                 B(LdaSmi), U8(2),
                 B(Star), R(9),
                 B(LdaSmi), U8(1),
                 B(Star), R(10),
                 B(Mov), R(5), R(6),
                 B(CallRuntime), U16(Runtime::kDefineDataPropertyInLiteral), R(6), U8(5),
-  /*  106 E> */ B(LdaContextSlot), R(context), U8(5), U8(0),
+  /*  106 E> */ B(LdaCurrentContextSlot), U8(5),
                 B(ToName), R(7),
                 B(LdaConstant), U8(3),
                 B(TestEqualStrict), R(7), U8(0),
                 B(Mov), R(4), R(6),
                 B(JumpIfToBooleanFalse), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowStaticPrototypeError), R(0), U8(0),
                 B(CreateClosure), U8(5), U8(2),
                 B(Star), R(8),
                 B(LdaSmi), U8(1),
                 B(Star), R(10),
@@ skipping 17 matching lines @@
 ]
 
 ---
 snippet: "
   var count = 0;
   class C { constructor() { count++; }}
   return new C();
 "
 frame size: 8
 parameter count: 1
-bytecode array length: 62
+bytecode array length: 60
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(3),
                 B(LdaTheHole),
                 B(Star), R(2),
   /*   30 E> */ B(StackCheck),
   /*   46 S> */ B(LdaZero),
-  /*   46 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   46 E> */ B(StaCurrentContextSlot), U8(4),
                 B(LdaTheHole),
                 B(Star), R(0),
   /*   49 S> */ B(LdaTheHole),
                 B(Star), R(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(5),
                 B(LdaSmi), U8(49),
                 B(Star), R(6),
                 B(LdaSmi), U8(86),
                 B(Star), R(7),
                 B(CallRuntime), U16(Runtime::kDefineClass), R(4), U8(4),
                 B(Star), R(4),
                 B(LdrNamedProperty), R(4), U8(1), U8(2), R(5),
                 B(CallRuntime), U16(Runtime::kToFastProperties), R(4), U8(1),
                 B(Star), R(0),
                 B(Star), R(1),
                 B(Star), R(2),
   /*   87 S> */ B(Nop),
   /*   94 E> */ B(New), R(2), R(0), U8(0), U8(4),
   /*  103 S> */ B(Return),
 ]
 constant pool: [
   SHARED_FUNCTION_INFO_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["prototype"],
 ]
 handlers: [
 ]