[PATCH] [Sanitizer] Get the Linux ptrace test working on PowerPC64

[Jay Foad]

>>! In D6108#7, @kcc wrote:
> - please upload patcehs with full context (easier with 'arc')

Done.

> - please don't rename the file to .c, instead cast integer to the enum type

Done.

> and file a bug against the linux headers and/or clang -- this warning must not be there. 

OK, I'll try to find someone to report it to.

http://reviews.llvm.org/D6108