[interpreter] Add CreateBlockContext bytecode

test/cctest/interpreter/bytecode_expectations/ContextVariables.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
@@ skipping 85 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   'use strict';
   let a = 1;
   { let b = 2; return function() { a + b; }; }
 "
-frame size: 4
+frame size: 2
 parameter count: 1
-bytecode array length: 43
+bytecode array length: 35
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(0),
                 B(LdaTheHole),
                 B(StaContextSlot), R(context), U8(4),
   /*   30 E> */ B(StackCheck),
   /*   56 S> */ B(LdaSmi), U8(1),
   /*   56 E> */ B(StaContextSlot), R(context), U8(4),
-                B(LdaConstant), U8(0),
-                B(Star), R(2),
-                B(Mov), R(closure), R(3),
-                B(CallRuntime), U16(Runtime::kPushBlockContext), R(2), U8(2),
+                B(Ldar), R(closure),
+                B(CreateBlockContext), U8(0),
                 B(PushContext), R(1),
                 B(LdaTheHole),
                 B(StaContextSlot), R(context), U8(4),
   /*   69 S> */ B(LdaSmi), U8(2),
   /*   69 E> */ B(StaContextSlot), R(context), U8(4),
   /*   72 S> */ B(CreateClosure), U8(1), U8(2),
                 B(PopContext), R(0),
   /*  104 S> */ B(Return),
 ]
 constant pool: [
@@ skipping 776 matching lines @@
   /* 3440 S> */ B(LdaSmi), U8(100),
   /* 3440 E> */ B(Wide), B(StaContextSlot), R16(context), U16(256),
   /* 3445 S> */ B(Wide), B(LdaContextSlot), R16(context), U16(256),
   /* 3454 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]