[turbofan] Add --csa-verify flag that enables machine graph verification of code stubs.

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index 27db1b85160e69f24f75809b280fe6408ba24b2b..c93af865c3418a16a36f2b24ee5f8d55fb7114ae 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -2952,7 +2952,7 @@ Node* CodeStubAssembler::IsHashTable(Node* object) {
 }
 
 Node* CodeStubAssembler::IsDictionary(Node* object) {
-  return WordOr(IsHashTable(object), IsUnseededNumberDictionary(object));
+  return Word32Or(IsHashTable(object), IsUnseededNumberDictionary(object));
 }
 
 Node* CodeStubAssembler::IsUnseededNumberDictionary(Node* object) {