Elliott Hughes bd7a892c30 Fix unwinding through x86-64 __bionic_clone.
x86-64 needs these CFI directives to stop unwinding here.
I've also cleaned up the assembler a little, and made x86 and x86-64
a little more alike.

Bug: 15195760

(cherry picked from commit aeb3016f8132689d1b49d30056005b667e3d2d0e)

Change-Id: I511fe238b1ef1a1c16aef735f93bbee9accb0689
2014-06-06 10:00:32 -07:00
..
2014-06-02 10:32:55 -07:00