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

test/cctest/interpreter/bytecode_expectations/CompoundExpressions.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: yes
 
 ---
 snippet: "
   var a = 1; a += 2;
@@ skipping 89 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 1; (function f() { return a; }); a |= 24;
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 29
+bytecode array length: 23
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(0),
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
-  /*   42 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   42 E> */ B(StaCurrentContextSlot), U8(4),
   /*   45 S> */ B(CreateClosure), U8(0), U8(2),
-  /*   75 S> */ B(LdrContextSlot), R(context), U8(4), U8(0), R(1),
+  /*   75 S> */ B(LdrCurrentContextSlot), U8(4), R(1),
                 B(BitwiseOrSmi), U8(24), R(1), U8(2),
-  /*   77 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   77 E> */ B(StaCurrentContextSlot), U8(4),
                 B(LdaUndefined),
   /*   84 S> */ B(Return),
 ]
 constant pool: [
   SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]