Fix build on sparc64-linux-gnu.

2018-11-05  Martin Liska  <mliska@suse.cz>

	PR sanitizer/87860
	* sanitizer_common/sanitizer_linux.cc:  Cherry-pick upstream
	r346129.

From-SVN: r265796

libsanitizer/ChangeLog

+2018-11-05  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/87860
+	* sanitizer_common/sanitizer_linux.cc:  Cherry-pick upstream
+	r346129.
+
 2018-10-31  Joseph Myers  <joseph@codesourcery.com>
 
 	PR bootstrap/82856

libsanitizer/sanitizer_common/sanitizer_linux.cc

@@ -1944,14 +1944,14 @@ static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
 #elif defined(__sparc__)
   ucontext_t *ucontext = (ucontext_t*)context;
   uptr *stk_ptr;
-# if defined (__sparcv9)
+# if defined(__sparcv9) || defined (__arch64__)
 # ifndef MC_PC
 #  define MC_PC REG_PC
 # endif
 # ifndef MC_O6
 #  define MC_O6 REG_O6
 # endif
-# ifdef SANITIZER_SOLARIS
+# if SANITIZER_SOLARIS
 #  define mc_gregs gregs
 # endif
   *pc = ucontext->uc_mcontext.mc_gregs[MC_PC];