[interpreter] Remove duped control scope in ForOfStatement.

This removes a duplicate control scope. The visitor for ForOfStatement
nodes in the AST uses VisitIterationBody which pushes a separate control
scope. The number of control scopes will be off when we use them for
tracking loop depths.

R=rmcilroy@chromium.org

Review-Url: https://codereview.chromium.org/2164503005
Cr-Commit-Position: refs/heads/master@{#37930}

src/interpreter/bytecode-generator.cc

@@ -1166,7 +1166,6 @@ void BytecodeGenerator::VisitForInStatement(ForInStatement* stmt) {
 
 void BytecodeGenerator::VisitForOfStatement(ForOfStatement* stmt) {
   LoopBuilder loop_builder(builder());
-  ControlScopeForIteration control_scope(this, stmt, &loop_builder);
 
   builder()->SetExpressionAsStatementPosition(stmt->assign_iterator());
   VisitForEffect(stmt->assign_iterator());

test/cctest/interpreter/bytecode_expectations/Generators.golden

@@ -265,7 +265,7 @@ snippet: "
 "
 frame size: 18
 parameter count: 1
-bytecode array length: 774
+bytecode array length: 772
 bytecodes: [
                 B(Ldar), R(new_target),
                 B(JumpIfUndefined), U8(26),
@@ -399,10 +399,10 @@ bytecodes: [
                 B(Star), R(15),
                 B(LdaZero),
                 B(TestEqualStrict), R(15),
-                B(JumpIfTrue), U8(45),
+                B(JumpIfTrue), U8(43),
                 B(LdaSmi), U8(2),
                 B(TestEqualStrict), R(15),
-                B(JumpIfTrue), U8(36),
+                B(JumpIfTrue), U8(34),
                 B(Jump), U8(2),
                 B(LdaTrue),
                 B(Star), R(17),
@@ -414,7 +414,6 @@ bytecodes: [
                 B(PopContext), R(2),
                 B(PopContext), R(2),
                 B(PopContext), R(2),
-                B(PopContext), R(2),
                 B(Star), R(9),
                 B(LdaZero),
                 B(Star), R(8),
@@ -425,7 +424,7 @@ bytecodes: [
                 B(PopContext), R(2),
                 B(LdaZero),
                 B(StaContextSlot), R(1), U8(9),
-                B(Wide), B(Jump), U16(-225),
+                B(Wide), B(Jump), U16(-223),
                 B(Jump), U8(46),
                 B(Star), R(13),
                 B(LdaConstant), U8(11),
@@ -600,9 +599,9 @@ constant pool: [
   kInstanceTypeDontCare,
 ]
 handlers: [
-  [44, 693, 699],
-  [150, 447, 453],
-  [153, 401, 403],
-  [550, 562, 564],
+  [44, 691, 697],
+  [150, 445, 451],
+  [153, 399, 401],
+  [548, 560, 562],
 ]