Fix Code::set_constant_pool_offset

constant_pool_offset can be equal to InstructionSize if the code doesn't
contains any extra entries.

Change-Id: I7340a0581cc9d97a802406b6c099412d38a673fc
Reviewed-on: https://chromium-review.googlesource.com/c/1412494Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#58835}

src/objects/code-inl.h

@@ -543,7 +543,7 @@ int Code::constant_pool_offset() const {
 
 void Code::set_constant_pool_offset(int value) {
   if (!FLAG_enable_embedded_constant_pool) return;
-  DCHECK_LT(value, InstructionSize());
+  DCHECK_LE(value, InstructionSize());
   WRITE_INT_FIELD(this, kConstantPoolOffset, value);
 }