[Interpreter] Add support for strict mode global stores.

test/unittests/interpreter/bytecode-array-builder-unittest.cc

Index: test/unittests/interpreter/bytecode-array-builder-unittest.cc
diff --git a/test/unittests/interpreter/bytecode-array-builder-unittest.cc b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
index 16dd47d1d14472edd4056751fb0a178fd703ba98..c35d6a23a513bf003571314deb1f602fe99ff67d 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -41,8 +41,9 @@ TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
   builder.LoadAccumulatorWithRegister(reg).StoreAccumulatorInRegister(reg);
 
   // Emit global load / store operations.
-  builder.LoadGlobal(1);
-  builder.StoreGlobal(1, LanguageMode::SLOPPY);
+  builder.LoadGlobal(1)
+      .StoreGlobal(1, LanguageMode::SLOPPY)
+      .StoreGlobal(1, LanguageMode::STRICT);
 
   // Emit context operations.
   builder.PushContext(reg);