value from a visit function
* Define a (file local) DELEGATE macro to make the code easier to read/maintain
* Define per-opcode delegation functions so that users can override specific
instances of BinaryOperator for example.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2290 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a new defaulted argument that allows the instruction visitation
visitors to return a non-void value.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2289 91177308-0d34-0410-b5e6-96231b3b80d8