Fix several cache coherence bugs in MemDep/GVN that were found.  Also add some (disabled) debugging code
to make such problems easier to diagnose in the future, written by Duncan Sands.

llvm-svn: 44695

into alias analysis.  This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter.  These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function.  Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite.  To reduce the
chance of misuse it is now protected.

llvm-svn: 44487

llvm-svn: 44437

llvm-svn: 44325

llvm-svn: 44323

llvm-svn: 43147

speedup for GVN.

llvm-svn: 42185

Add a new DenseMapInfo::isEqual method to allow clients to redefine
the equality predicate used when probing the hash table.

llvm-svn: 42042

llvm-svn: 41998

llvm-svn: 41131

llvm-svn: 41129

they're not related to eliminating a load.

llvm-svn: 41081

llvm-svn: 41080

llvm-svn: 41078

the function.

llvm-svn: 41077

llvm-svn: 40961

llvm-svn: 40946

llvm-svn: 40909

llvm-svn: 40791

llvm-svn: 40776

llvm-svn: 40750

llvm-svn: 40746

llvm-svn: 40692

llvm-svn: 40655

removal of redundant phis.

llvm-svn: 40650

llvm-svn: 40642

llvm-svn: 40607

use up the entire 32-bit address space.

llvm-svn: 40596

llvm-svn: 40595

almost the same things from LCSSA.

llvm-svn: 40540

llvm-svn: 40503

llvm-svn: 40498

llvm-svn: 40497

llvm-svn: 40494

Note: This has not yet been thoroughly tested.  Use at your own risk.

llvm-svn: 40489

load elimination code from RedundantLoadElimination.

llvm-svn: 40469