[interpreter] ToObject never yields null.

test/cctest/interpreter/bytecode_expectations/ForIn.golden

Index: test/cctest/interpreter/bytecode_expectations/ForIn.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/ForIn.golden b/test/cctest/interpreter/bytecode_expectations/ForIn.golden
index fd6c7ede82296612ee787a8b2a1ebad60542c0be..25656ae26f8cfacd23cff23e3a6d8368216321a6 100644
--- a/test/cctest/interpreter/bytecode_expectations/ForIn.golden
+++ b/test/cctest/interpreter/bytecode_expectations/ForIn.golden
@@ -65,15 +65,14 @@ snippet: "
 "
 frame size: 8
 parameter count: 1
-bytecode array length: 46
+bytecode array length: 44
 bytecodes: [
   B(StackCheck),
   B(LdaConstant), U8(0),
   B(Star), R(1),
-  B(JumpIfUndefined), U8(39),
-  B(JumpIfNull), U8(37),
+  B(JumpIfUndefined), U8(37),
+  B(JumpIfNull), U8(35),
   B(ToObject),
-  B(JumpIfNull), U8(34),
   B(Star), R(3),
   B(ForInPrepare), R(4),
   B(LdaZero),
@@ -106,16 +105,15 @@ snippet: "
 "
 frame size: 9
 parameter count: 1
-bytecode array length: 58
+bytecode array length: 56
 bytecodes: [
   B(StackCheck),
   B(LdaZero),
   B(Star), R(1),
   B(CreateArrayLiteral), U8(0), U8(0), U8(3),
-  B(JumpIfUndefined), U8(48),
-  B(JumpIfNull), U8(46),
+  B(JumpIfUndefined), U8(46),
+  B(JumpIfNull), U8(44),
   B(ToObject),
-  B(JumpIfNull), U8(43),
   B(Star), R(3),
   B(ForInPrepare), R(4),
   B(LdaZero),
@@ -155,17 +153,16 @@ snippet: "
 "
 frame size: 8
 parameter count: 1
-bytecode array length: 95
+bytecode array length: 93
 bytecodes: [
   B(StackCheck),
   B(CreateObjectLiteral), U8(0), U8(0), U8(9),
   B(Star), R(1),
   B(Star), R(0),
   B(CreateArrayLiteral), U8(1), U8(1), U8(3),
-  B(JumpIfUndefined), U8(80),
-  B(JumpIfNull), U8(78),
+  B(JumpIfUndefined), U8(78),
+  B(JumpIfNull), U8(76),
   B(ToObject),
-  B(JumpIfNull), U8(75),
   B(Star), R(1),
   B(ForInPrepare), R(2),
   B(LdaZero),
@@ -217,16 +214,15 @@ snippet: "
 "
 frame size: 9
 parameter count: 1
-bytecode array length: 70
+bytecode array length: 68
 bytecodes: [
   B(StackCheck),
   B(CreateArrayLiteral), U8(0), U8(0), U8(3),
   B(Star), R(0),
   B(CreateArrayLiteral), U8(1), U8(1), U8(3),
-  B(JumpIfUndefined), U8(57),
-  B(JumpIfNull), U8(55),
+  B(JumpIfUndefined), U8(55),
+  B(JumpIfNull), U8(53),
   B(ToObject),
-  B(JumpIfNull), U8(52),
   B(Star), R(1),
   B(ForInPrepare), R(2),
   B(LdaZero),