[llvm-mca][x86] Fix all resources-x86_64.s tests to use different registers in reg-reg cases

I noticed while working on zero-idiom + dependency-breaking support (PR36671) that most of our binary instruction tests were reusing the same src registers, which would cause the tests to fail once we enable scalar zero-idiom support on btver2. Fixed in all targets to keep them in sync.

llvm-svn: 334110