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

test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: yes
 
 ---
 snippet: "
   const x = 10; function f1() {return x;}
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 23
+bytecode array length: 19
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(LdaTheHole),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   44 S> */ B(LdaSmi), U8(10),
-  /*   44 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   44 E> */ B(StaCurrentContextSlot), U8(4),
                 B(LdaUndefined),
   /*   74 S> */ B(Return),
 ]
 constant pool: [
   SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   const x = 10; function f1() {return x;} return x;
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 26
+bytecode array length: 20
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(LdaTheHole),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   44 S> */ B(LdaSmi), U8(10),
-  /*   44 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
-  /*   74 S> */ B(LdaContextSlot), R(context), U8(4), U8(0),
+  /*   44 E> */ B(StaCurrentContextSlot), U8(4),
+  /*   74 S> */ B(LdaCurrentContextSlot), U8(4),
   /*   84 S> */ B(Return),
 ]
 constant pool: [
   SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   const x = (x = 20); function f1() {return x;}
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 45
+bytecode array length: 39
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(LdaTheHole),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   47 S> */ B(LdaSmi), U8(20),
                 B(Star), R(2),
-  /*   47 E> */ B(LdaContextSlot), R(context), U8(4), U8(0),
+  /*   47 E> */ B(LdaCurrentContextSlot), U8(4),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(1),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(3), U8(1),
                 B(CallRuntime), U16(Runtime::kThrowConstAssignError), R(0), U8(0),
-  /*   47 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   47 E> */ B(StaCurrentContextSlot), U8(4),
                 B(LdaUndefined),
   /*   80 S> */ B(Return),
 ]
 constant pool: [
   SHARED_FUNCTION_INFO_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["x"],
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   const x = 10; x = 20; function f1() {return x;}
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 30
+bytecode array length: 26
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(LdaTheHole),
-                B(StaContextSlot), R(context), U8(4), U8(0),
+                B(StaCurrentContextSlot), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   44 S> */ B(LdaSmi), U8(10),
-  /*   44 E> */ B(StaContextSlot), R(context), U8(4), U8(0),
+  /*   44 E> */ B(StaCurrentContextSlot), U8(4),
   /*   48 S> */ B(LdaSmi), U8(20),
   /*   50 E> */ B(CallRuntime), U16(Runtime::kThrowConstAssignError), R(0), U8(0),
                 B(LdaUndefined),
   /*   82 S> */ B(Return),
 ]
 constant pool: [
   SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]