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

test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden

Index: test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden b/test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden
index 1d17e2852c8607d3f3ffec516a148267901e0fa1..b565e4b113aa28086954171b7d21e72672b858c8 100644
--- a/test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden
+++ b/test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden
@@ -11,17 +11,17 @@ snippet: "
 "
 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(StaLocalContextSlot), 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(StaLocalContextSlot), U8(4),
                 B(LdaUndefined),
   /*   74 S> */ B(Return),
 ]
@@ -37,18 +37,18 @@ snippet: "
 "
 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(StaLocalContextSlot), 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(StaLocalContextSlot), U8(4),
+  /*   74 S> */ B(LdaLocalContextSlot), U8(4),
   /*   84 S> */ B(Return),
 ]
 constant pool: [
@@ -63,24 +63,24 @@ snippet: "
 "
 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(StaLocalContextSlot), 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(LdaLocalContextSlot), 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(StaLocalContextSlot), U8(4),
                 B(LdaUndefined),
   /*   80 S> */ B(Return),
 ]
@@ -97,17 +97,17 @@ snippet: "
 "
 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(StaLocalContextSlot), 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(StaLocalContextSlot), U8(4),
   /*   48 S> */ B(LdaSmi), U8(20),
   /*   50 E> */ B(CallRuntime), U16(Runtime::kThrowConstAssignError), R(0), U8(0),
                 B(LdaUndefined),