[PATCH] Implement ARM EHABI exception handling.

[Logan Chien]

* Update the LIBCXXABI_ARM_EHABI condition.

* Use static to hide __cxa_end_cleanup_impl().

* Refine the code for exception_spec_can_catch() so that it will look
  much similar with the Itanium version.  Besides, several comments are
  added to address Jonathan's comment.

* Load phase 1 result in phase 2 so that we don't have to search for
  the catch handler again.  Besides, we don't have to change scan_eh_tab()
  any more.

http://reviews.llvm.org/D3613

Files:
  include/cxxabi.h
  include/unwind.h
  src/cxa_demangle.cpp
  src/cxa_exception.cpp
  src/cxa_exception.hpp
  src/cxa_personality.cpp
  test/test_demangle.cpp
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