Fix GNU ObjC ABI for a message returning a struct.

This allows the ObjFW runtime to correctly implement message forwarding
for messages which return a struct.

Patch by Jonathan Schleifer.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187174 91177308-0d34-0410-b5e6-96231b3b80d8
Fix gcc search for cross-compiler on Ubuntu 13.04.

Just more craziness to find crtbegin.o etc.

Patch by Stephen Kelly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187175 91177308-0d34-0410-b5e6-96231b3b80d8
Tighten type-checking for vector attributes.

Based on patch by Yunzhong Gao.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187176 91177308-0d34-0410-b5e6-96231b3b80d8