Back off from 32 alignment of various guest state bits.  We don't
actually need it, and gcc on MacOS simply fails (for whatever reason)
to actually honour requests for 32 alignment, and fall back to the
previous setting (16 alignment).



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12817 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/pub_core_threadstate.h b/coregrind/pub_core_threadstate.h
index 2e80f87..403d3de 100644
--- a/coregrind/pub_core_threadstate.h
+++ b/coregrind/pub_core_threadstate.h
@@ -104,19 +104,19 @@
 
       /* Note that for code generation reasons, we require that the
          guest state area, its two shadows, and the spill area, are
-         32-aligned and have 32-aligned sizes, and there are no holes
+         16-aligned and have 16-aligned sizes, and there are no holes
          in between.  This is checked by do_pre_run_checks() in
          scheduler.c. */
 
       /* Saved machine context. */
-      VexGuestArchState vex __attribute__((aligned(32)));
+      VexGuestArchState vex __attribute__((aligned(16)));
 
       /* Saved shadow context (2 copies). */
-      VexGuestArchState vex_shadow1 __attribute__((aligned(32)));
-      VexGuestArchState vex_shadow2 __attribute__((aligned(32)));
+      VexGuestArchState vex_shadow1 __attribute__((aligned(16)));
+      VexGuestArchState vex_shadow2 __attribute__((aligned(16)));
 
       /* Spill area. */
-      UChar vex_spill[LibVEX_N_SPILL_BYTES] __attribute__((aligned(32)));
+      UChar vex_spill[LibVEX_N_SPILL_BYTES] __attribute__((aligned(16)));
 
       /* --- END vex-mandated guest state --- */
    }