R600: Implement isTruncateFree

Truncation is just accessing a subregister for any multiple of
the register size, so it's free.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201107 91177308-0d34-0410-b5e6-96231b3b80d8
Change the begin and end methods in ObjectFile to match the style guide.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201108 91177308-0d34-0410-b5e6-96231b3b80d8
Fix an old FIXME. LDPO_PIE is available since 2.23, realeased 2012-10-22.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201110 91177308-0d34-0410-b5e6-96231b3b80d8
cmake: Do not export targets when installing toolchain only

Patch by Brad King!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201111 91177308-0d34-0410-b5e6-96231b3b80d8