[stubs] Add FLAG_enable_slow_asserts check to CSA_SLOW_ASSERT

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 10051a09afb21b88bf69d9fccaaa6a3e17759211..869afe42ab4b068712f26435a0913063ee1c1fec 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -1198,7 +1198,10 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
 
 #define CSA_ASSERT(x) Assert((x), #x, __FILE__, __LINE__)
 #ifdef ENABLE_SLOW_DCHECKS
-#define CSA_SLOW_ASSERT(x) Assert((x), #x, __FILE__, __LINE__)
+#define CSA_SLOW_ASSERT(x)               \
+  if (FLAG_enable_slow_asserts) {        \
+    Assert((x), #x, __FILE__, __LINE__); \
+  }
 #else
 #define CSA_SLOW_ASSERT(x)
 #endif