[interpreter] Strengthen a DCHECK.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index 8f43b0764da7512cc775eb13a65a956fb545d4f2..7d3fd466723650e88279d0a5edca2cf2bb397b58 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -947,6 +947,7 @@ void BytecodeGenerator::VisitVariableDeclaration(VariableDeclaration* decl) {
 
 void BytecodeGenerator::VisitFunctionDeclaration(FunctionDeclaration* decl) {
   Variable* variable = decl->proxy()->var();
+  DCHECK(variable->mode() == LET || variable->mode() == VAR);
   switch (variable->location()) {
     case VariableLocation::GLOBAL:
     case VariableLocation::UNALLOCATED: {
@@ -957,8 +958,6 @@ void BytecodeGenerator::VisitFunctionDeclaration(FunctionDeclaration* decl) {
     case VariableLocation::PARAMETER:
     case VariableLocation::LOCAL: {
       VisitForAccumulatorValue(decl->fun());
-      DCHECK(variable->mode() == LET || variable->mode() == VAR ||
-             variable->mode() == CONST);
       VisitVariableAssignment(variable, Token::INIT,
                               FeedbackVectorSlot::Invalid());
       break;