[libcxxabi patch] Add Registers_arm class and unw_getcontext implementation

[Nico Weber]

Hi,

the attached patch adds Registers_arm and assembly for unw_getcontext. VFP
support is still missing. The class isn't used by anything yet.

One thing we were wondering about: Registers_arm64::validRegister() returns
true for UNW_ARM64_D0 - UNW_ARM64_D31, but Registers_arm64::getRegister()
aborts if one of these is passed in, which suggests that unw_get_reg() will
abort if called for one of these registers. Should validRegister() return
false for the D registers? (The 32bit implementation does the same thing as
the 64bit implementation for now.)

Nico
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