Merge pull request #5082 from tbrk/pointer-hashing

generic test of pointer size in model_cache

Author: lperron

ortools/constraint_solver/model_cache.h

@@ -51,7 +51,8 @@ inline uint64_t Hash1(int value) { return Hash1(static_cast<uint32_t>(value)); }
 
 inline uint64_t Hash1(void* const ptr) {
 #if defined(__x86_64__) || defined(_M_X64) || defined(__powerpc64__) || \
-    defined(__aarch64__) || (defined(_MIPS_SZPTR) && (_MIPS_SZPTR == 64))
+    defined(__aarch64__) || (defined(_MIPS_SZPTR) && (_MIPS_SZPTR == 64)) || \
+    (defined(INTPTR_MAX) && defined(INT64_MAX) && (INTPTR_MAX == INT64_MAX))
   return Hash1(reinterpret_cast<uint64_t>(ptr));
 #else
   return Hash1(reinterpret_cast<uint32_t>(ptr));