llvm-svn: 94863

create a testcase where this matters.  The select+load transformation only
occurs when isSafeToLoadUnconditionally is true, and in those situations,
instcombine also changes the underlying objects to be aligned.  This seems
like a good idea regardless, and I've verified that it doesn't pessimize
the subsequent realignment.

llvm-svn: 94850

indices are safe if the result is known to be within the bounds of the
underlying object.

llvm-svn: 94829

llvm-svn: 94194

llvm-svn: 94112

llvm-svn: 93831

llvm-svn: 92685