Revert r212572 "improve BasicAA CS-CS queries", it causes PR20303.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213024 91177308-0d34-0410-b5e6-96231b3b80d8
Teach GetUnderlyingObject / BasicAA about addrspacecast

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213025 91177308-0d34-0410-b5e6-96231b3b80d8
Document the maximum LLVM IR alignment, which is 1 << 29 or 0.5 GiB

Add verifier checks.  We already check these in the assembly parser, but
a frontend producing IR in memory wouldn't hit those checks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213027 91177308-0d34-0410-b5e6-96231b3b80d8
Improve test 'CodeGen/X86/combine-vec-shuffle-3.ll'.
Now functions 'test4', 'test9', 'test14' and 'test19' correctly perform
a move of two packed values from the high quadword of vector %b to the low
quadword of vector %a (movhlps idiom).

No functional change intended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213029 91177308-0d34-0410-b5e6-96231b3b80d8