ARM64: Fix and improve MacroAssembler::Printf.
- W-sized values passed to Printf are now handled correctly by the
simulator. In AAPCS64, int32_t and int64_t are passed in the same
way, so this didn't affect non-simulator builds.
- Since Printf now records the type and size of each argument, it is
possible to mix argument types.
- It is now possible to print the stack pointer. There is only one
remaining restriction: The `csp` register cannot be printed unless
it is the current stack pointer. This is because it is modified by
BumpSystemStackPointer when the caller-saved registers are
preserved.
BUG=
R=rmcilroy@chromium.org
Review URL: https://codereview.chromium.org/
268353005
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21272
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00