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

test/cctest/interpreter/bytecode_expectations/CreateArguments.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: no
 test function name: f
 
 ---
 snippet: "
@@ skipping 56 matching lines @@
 handlers: [
 ]
 
 ---
 snippet: "
   function f(a) { return arguments[0]; }
   f();
 "
 frame size: 2
 parameter count: 2
-bytecode array length: 19
+bytecode array length: 17
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(Ldar), R(arg0),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateMappedArguments),
                 B(Star), R(0),
   /*   10 E> */ B(StackCheck),
   /*   16 S> */ B(LdaZero),
   /*   32 E> */ B(LdaKeyedProperty), R(0), U8(2),
   /*   37 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   function f(a, b, c) { return arguments; }
   f();
 "
 frame size: 2
 parameter count: 4
-bytecode array length: 28
+bytecode array length: 22
 bytecodes: [
                 B(CreateFunctionContext), U8(3),
                 B(PushContext), R(1),
                 B(Ldar), R(arg0),
-                B(StaContextSlot), R(context), U8(6), U8(0),
+                B(StaCurrentContextSlot), U8(6),
                 B(Ldar), R(arg1),
-                B(StaContextSlot), R(context), U8(5), U8(0),
+                B(StaCurrentContextSlot), U8(5),
                 B(Ldar), R(arg2),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateMappedArguments),
                 B(Star), R(0),
   /*   10 E> */ B(StackCheck),
   /*   22 S> */ B(Nop),
   /*   40 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]
@@ skipping 11 matching lines @@
                 B(Star), R(0),
   /*   10 E> */ B(StackCheck),
   /*   36 S> */ B(Nop),
   /*   54 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]