Fix typo in x86_64 VisitJdkUnsafePutByte

The type should have been Int instead of Uint like others
in r.android.com/2751787

Bug: 313284159
Test: art/test/testrunner/testrunner.py --target --64 --optimizing
Change-Id: Id43a744a33b40318b86046df2b2e1932aff6b9e8
1 file changed