Revert r23732 ("ARM64: Fix and improve --trace-sim register trace.") and r23733 ("ARM64: Fix build warning in r23732.)

They break the build when compiling with optimizations, e.g. optdebug:

../src/arm64/simulator-arm64.cc: In member function ‘void v8::internal::Simulator::PrintWriteFP(uintptr_t, size_t, unsigned int)’:
../src/arm64/simulator-arm64.cc:792:29: error: array subscript is above array bounds [-Werror=array-bounds]
../src/arm64/simulator-arm64.cc:799:29: error: array subscript is above array bounds [-Werror=array-bounds]

TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/549083004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23765 ce2b1a6d-e550-0410-aec6-3dcde31c8c00