Bug 338703 helgrind on arm-linux gets false positives in dynamic loader.

There are a couple of issues with helgrind on arm-linux with glibc:

- Thread creation stack traces cannot unwind through clone
  (cfi ends right after syscall)
- ld.so has a special "hard float" name that isn't recognized as special
  (ld-linux-armhf.so.3)
- Races are found when manipulating GOT sections.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14407 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/helgrind/hg_main.c b/helgrind/hg_main.c
index d2261e2..46f64e3 100644
--- a/helgrind/hg_main.c
+++ b/helgrind/hg_main.c
@@ -1579,7 +1579,7 @@
       { Word first_ip_delta = 0;
 #       if defined(VGP_amd64_linux) || defined(VGP_x86_linux)
         first_ip_delta = -3;
-#       elif defined(VGP_arm64_linux)
+#       elif defined(VGP_arm64_linux) || defined(VGP_arm_linux)
         first_ip_delta = -1;
 #       endif
         thr_c->created_at = VG_(record_ExeContext)(parent, first_ip_delta);
@@ -4480,6 +4480,7 @@
    if (VG_STREQ(soname, VG_U_LD64_SO_2))            return True;
    if (VG_STREQ(soname, VG_U_LD_SO_1))              return True;
    if (VG_STREQ(soname, VG_U_LD_LINUX_AARCH64_SO_1)) return True;
+   if (VG_STREQ(soname, VG_U_LD_LINUX_ARMHF_SO_3))  return True;
 #  elif defined(VGO_darwin)
    if (VG_STREQ(soname, VG_U_DYLD)) return True;
 #  else