add launchpad bug reports without comments

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+Wrong signal handling in qemu-aarch64.
+
+Running GCC 5.0 testsuite under qemu-aarch64, I noticed that tests connected with stack unwinding fail with:
+
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+
+or run into infinite loop.
+
+Here is one example:
+
+$ /home/max/build/gcc-aarch64/gcc/xgcc -B/home/max/build/gcc-aarch64/gcc/ /home/max/src/toolchain/gcc/gcc/testsuite/gcc.dg/cleanup-11.c -fexceptions -fnon-call-exceptions -O2 -lm -o ./cleanup-11.exe
+
+$ qemu-aarch64 -L /home/max/install/aarch64/aarch64-linux/sys-root/ -R 0 -/cleanup-11.exe
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped.
+
+Actually, this caused by ABI incompatibility between Linux Kernel (trunk) and qemu-aarch64. In fact, size of siginfo structure in Linux and target_siginfo structure in qemu-aarch64 differ:
+
+sizeof (struct target_siginfo) = 136  // QEMU
+sizeof (struct siginfo) = 128               // Linux Kernel
+
+
+This caused by wrong TARGET_SI_PAD_SIZE defined in  linux-user/syscall_defs.h:
+
+#define TARGET_SI_PAD_SIZE	((TARGET_SI_MAX_SIZE/sizeof(int)) - 3)
+
+In Kernel respective value is:
+
+#define SI_PAD_SIZE     ((SI_MAX_SIZE - __ARCH_SI_PREAMBLE_SIZE) / sizeof(int))
+.............................................
+#define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))  // for Aarch64
+
+Trivial fix, changing TARGET_SI_PAD_SIZE to right value, is attached.
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