Fixed insidious bug in handling dereferences.

llvm-svn: 46835

using the bump-pointer allocator and a placed new; we accidentally allocated
a ValueStateImpl* instead, causing an overrun when we did a placed new().

llvm-svn: 46793

This action will add constraints to the possible values of a symbol.
Still needs to be debugged.

llvm-svn: 46789

This noticeably cleans up the naming of these classes.

llvm-svn: 46770

Added a "ConstantNotEq" map to ValueState (and added necessary typedefs and factory objects to ValueStateManager).

llvm-svn: 46758

structure that can contain several maps, not just one.

llvm-svn: 46744

__builtin_choose.

llvm-svn: 46731

llvm-svn: 46722