[interpreter] Add CreateFunctionContext bytecode

test/cctest/interpreter/bytecode_expectations/LetVariableContextSlot.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
 snippet: "
   let x = 10; function f1() {return x;}
 "
 frame size: 2
 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(1),
                 B(LdaTheHole),
                 B(StaContextSlot), R(context), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(10),
   /*   42 E> */ B(StaContextSlot), R(context), U8(4),
                 B(LdaUndefined),
   /*   72 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   let x = 10; function f1() {return x;} return x;
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 37
+bytecode array length: 34
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(LdaTheHole),
                 B(StaContextSlot), R(context), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(10),
   /*   42 E> */ B(StaContextSlot), R(context), U8(4),
   /*   72 S> */ B(LdaContextSlot), R(context), U8(4),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(1),
                 B(Star), R(2),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
   /*   82 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   let x = (x = 20); function f1() {return x;}
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 45
+bytecode array length: 42
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(LdaTheHole),
                 B(StaContextSlot), R(context), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   45 S> */ B(LdaSmi), U8(20),
                 B(Star), R(2),
   /*   45 E> */ B(LdaContextSlot), R(context), U8(4),
                 B(JumpIfNotHole), U8(11),
@@ skipping 12 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   let x = 10; x = 20; function f1() {return x;}
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 47
+bytecode array length: 44
 bytecodes: [
-                B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
+                B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
                 B(LdaTheHole),
                 B(StaContextSlot), R(context), U8(4),
                 B(CreateClosure), U8(0), U8(2),
                 B(Star), R(0),
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(10),
   /*   42 E> */ B(StaContextSlot), R(context), U8(4),
   /*   46 S> */ B(LdaSmi), U8(20),
                 B(Star), R(2),
   /*   48 E> */ B(LdaContextSlot), R(context), U8(4),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(1),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(3), U8(1),
                 B(Ldar), R(2),
                 B(StaContextSlot), R(context), U8(4),
                 B(LdaUndefined),
   /*   80 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]