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

test/cctest/interpreter/bytecode_expectations/BreakableBlocks.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: yes
 
 ---
 snippet: "
   var x = 0;
@@ skipping 83 matching lines @@
 ---
 snippet: "
   outer: {
     let y = 10;
     function f() { return y; }
     break outer;
   }
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 34
+bytecode array length: 30
 bytecodes: [
   /*   30 E> */ B(StackCheck),
                 B(Ldar), R(closure),
                 B(CreateBlockContext), U8(0),
                 B(PushContext), R(2),
                 B(LdaTheHole),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateClosure), U8(1), U8(2),
                 B(Star), R(0),
   /*   53 S> */ B(LdaSmi), U8(10),
-  /*   53 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   53 E> */ B(StaCurrentContextSlot), U8(4),
                 B(Mov), R(0), R(1),
                 B(Ldar), R(0),
   /*   88 S> */ B(Jump), U8(2),
                 B(PopContext), R(2),
                 B(LdaUndefined),
   /*  103 S> */ B(Return),
 ]
 constant pool: [
   FIXED_ARRAY_TYPE,
   SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   let x = 1;
   outer: {
     inner: {
      let y = 2;
       function f() { return x + y; }
       if (y) break outer;
       y = 3;
     }
   }
   x = 4;
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 67
+bytecode array length: 53
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(2),
                 B(LdaTheHole),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
   /*   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),
                 B(Ldar), R(closure),
                 B(CreateBlockContext), U8(0),
                 B(PushContext), R(3),
                 B(LdaTheHole),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateClosure), U8(1), U8(2),
                 B(Star), R(0),
   /*   76 S> */ B(LdaSmi), U8(2),
-  /*   76 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   76 E> */ B(StaCurrentContextSlot), U8(4),
                 B(Mov), R(0), R(1),
-  /*  118 S> */ B(LdaContextSlot), R(context), U8(4), U8(0),
+  /*  118 S> */ B(LdaCurrentContextSlot), U8(4),
                 B(JumpIfToBooleanFalse), U8(6),
   /*  125 S> */ B(PopContext), R(3),
-                B(Jump), U8(10),
+                B(Jump), U8(8),
   /*  142 S> */ B(LdaSmi), U8(3),
-  /*  144 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*  144 E> */ B(StaCurrentContextSlot), U8(4),
                 B(PopContext), R(3),
   /*  155 S> */ B(LdaSmi), U8(4),
-  /*  157 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*  157 E> */ B(StaCurrentContextSlot), U8(4),
                 B(LdaUndefined),
   /*  162 S> */ B(Return),
 ]
 constant pool: [
   FIXED_ARRAY_TYPE,
   SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]