Cleanup arm assembly.

Remove the old arm directives.
Change the non-local labels to .L labels.
Add cfi directives to strcpy.S.

Change-Id: I9bafee1ffe5d85c92d07cfa8a85338cef9759562
Signed-off-by: Jake Weinstein <xboxlover360@gmail.com>
Add stpcpy assembler version.

For generic, continue to use the C version of the code.

Bug: 13746695
Change-Id: I77426a70b06131f2373bb51265bea1240bb3f101
Signed-off-by: Jake Weinstein <xboxlover360@gmail.com>