rs6000: Fix sanitizer build (PR90639)

The assembler code needs to say it uses AltiVec instructions.


libsanitizer/
	PR target/90639
	* tsan/tsan_rtl_ppc64.S: Add ".machine altivec".

From-SVN: r271668

libsanitizer/ChangeLog

+2019-05-27  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/90639
+	* tsan/tsan_rtl_ppc64.S: Add ".machine altivec".
+
 2019-05-14  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* configure.ac (have_dl_iterate_phdr): Remove *-*-solaris2.10*

libsanitizer/tsan/tsan_rtl_ppc64.S

 #include "tsan_ppc_regs.h"
 
+        .machine altivec
         .section .text
         .hidden __tsan_setjmp
         .globl _setjmp