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

[Kostya Serebryany]

================
Comment at: test/sanitizer_common/TestCases/Linux/ptrace.cc:36
@@ -33,1 +35,3 @@
       printf("%x\n", fpregs.mxcsr);
+#endif
+
----------------
#endif  // __x86_64__

================
Comment at: test/sanitizer_common/TestCases/Linux/ptrace.cc:46
@@ +45,3 @@
+    elf_fpregset_t fpregs;
+    res = ptrace((enum __ptrace_request)PTRACE_GETFPREGS, pid, NULL, &fpregs);
+    assert(!res);
----------------
Can you file a bug against clang? 
It should not issue a waning here even w/o the explicit cast. 
The bug may end up being in the Linux headers, not in clang)

================
Comment at: test/sanitizer_common/TestCases/Linux/ptrace.cc:50
@@ -34,1 +49,3 @@
+      printf("%lx\n", (elf_greg_t)fpregs[32]);
+#endif
 
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#endif  // __powerpc64__

http://reviews.llvm.org/D6108