Fix incorrect warning supression

Folly/folly/lang/Bits.h

@@ -325,7 +325,7 @@ inline T partialLoadUnaligned(const void* p, size_t l) {
   auto cp = static_cast<const char*>(p);
   T value = 0;
 FOLLY_PUSH_WARNING
-FOLLY_MSVC_DISABLE_WARNING(4324) // structure was padded due to alignment specifier
+FOLLY_MSVC_DISABLE_WARNING(4127) // conditional expression is constant
   if (!kHasUnalignedAccess || !kIsLittleEndian) {
 FOLLY_POP_WARNING
     // Unsupported, use memcpy.