[interpreter] Add CreateFunctionContext bytecode

test/cctest/interpreter/bytecode_expectations/ContextVariables.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
 snippet: "
   var a; return function() { a = 1; };
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 12
+bytecode array length: 9
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                B(CreateFunctionContext), U8(1),
                 B(PushContext), R(0),
   /*   30 E> */ B(StackCheck),
   /*   41 S> */ B(CreateClosure), U8(0), U8(2),
   /*   71 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 1; return function() { a = 2; };
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 17
+bytecode array length: 14
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                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),
   /*   45 S> */ B(CreateClosure), U8(0), U8(2),
   /*   75 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 1; var b = 2; return function() { a = 2; b = 3 };
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 22
+bytecode array length: 19
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                B(CreateFunctionContext), U8(2),
                 B(PushContext), R(0),
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
   /*   42 E> */ B(StaContextSlot), R(context), U8(4),
   /*   53 S> */ B(LdaSmi), U8(2),
   /*   53 E> */ B(StaContextSlot), R(context), U8(5),
   /*   56 S> */ B(CreateClosure), U8(0), U8(2),
   /*   92 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a; (function() { a = 2; })(); return a;
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 24
+bytecode array length: 21
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                B(CreateFunctionContext), U8(1),
                 B(PushContext), R(0),
   /*   30 E> */ B(StackCheck),
   /*   41 S> */ B(LdrUndefined), R(2),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(1),
   /*   64 E> */ B(Call), R(1), R(2), U8(1), U8(1),
   /*   68 S> */ B(LdaContextSlot), R(context), U8(4),
   /*   78 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   'use strict';
   let a = 1;
   { let b = 2; return function() { a + b; }; }
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 46
+bytecode array length: 43
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                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),
@@ skipping 264 matching lines @@
   var a245 = 0;
   var a246 = 0;
   var a247 = 0;
   var a248 = 0;
   eval();
   var b = 100;
   return b
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 1043
+bytecode array length: 1040
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                B(CreateFunctionContext), U8(253),
                 B(PushContext), R(0),
                 B(Ldar), R(this),
                 B(StaContextSlot), R(context), U8(4),
                 B(CreateUnmappedArguments),
                 B(StaContextSlot), R(context), U8(5),
                 B(Ldar), R(new_target),
                 B(StaContextSlot), R(context), U8(6),
   /*   30 E> */ B(StackCheck),
   /*   57 S> */ B(LdaZero),
   /*   57 E> */ B(StaContextSlot), R(context), U8(7),
@@ skipping 499 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: [
 ]