Fix breakpad for arm on arm64

On arm64 devices, GETFPREGS fails with errno==EIO. Ignore those failures
on Android arm builds.

BUG=508324
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1268023003 .

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1479 4c0a9323-5329-0410-9bdc-e9ce6186880e
diff --git a/src/client/linux/minidump_writer/linux_ptrace_dumper.cc b/src/client/linux/minidump_writer/linux_ptrace_dumper.cc
index 5ea0050..c35e0e9 100644
--- a/src/client/linux/minidump_writer/linux_ptrace_dumper.cc
+++ b/src/client/linux/minidump_writer/linux_ptrace_dumper.cc
@@ -206,12 +206,18 @@
     return false;
   }
 
+#if !(defined(__ANDROID__) && defined(__ARM_EABI__))
+  // When running an arm build on an arm64 device, attempting to get the
+  // floating point registers fails. On Android, the floating point registers
+  // aren't written to the cpu context anyway, so just don't get them here.
+  // See http://crbug.com/508324
   void* fp_addr;
   info->GetFloatingPointRegisters(&fp_addr, NULL);
   if (sys_ptrace(PTRACE_GETFPREGS, tid, NULL, fp_addr) == -1) {
     return false;
   }
 #endif
+#endif  // PTRACE_GETREGSET
 
 #if defined(__i386)
 #if !defined(bit_FXSAVE)  // e.g. Clang