Use a sorted array to store the information about a few address spaces.

We don't have any test with more than 6 address spaces, so a DenseMap is
probably not the correct answer.

An unsorted array would also be OK, but we have to sort it for printing anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202275 91177308-0d34-0410-b5e6-96231b3b80d8
Compare DataLayout by Value, not by pointer.

This fixes spurious warnings in llvm-link about the datalayout not matching.

Thanks to Zalman Stern for reporting the bug!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202276 91177308-0d34-0410-b5e6-96231b3b80d8
Fix typo. Thanks to Roman Divacky for noticing it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202277 91177308-0d34-0410-b5e6-96231b3b80d8