[csa] Add IsIntPtrOrSmiConstantZero to detect and optimize constant zero values

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 21ed7daef057edf6009c0893e4d921c3599add97..64d2cb2422e9acf7a74fd27b50c11317852048ed 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -140,6 +140,8 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
 
   Node* IntPtrOrSmiConstant(int value, ParameterMode mode);
 
+  bool IsIntPtrOrSmiConstantZero(Node* test);
+
   // Round the 32bits payload of the provided word up to the next power of two.
   Node* IntPtrRoundUpToPowerOfTwo32(Node* value);
   // Select the maximum of the two provided IntPtr values.