[SimplifyCFG] Don't lower complex ConstantExprs to lookup tables

Not all ConstantExprs can be represented by a global variable, for example most
pointer arithmetic other than addition of a constant, so we can't convert these
values from switch statements to lookup tables.

Differential Revision: https://reviews.llvm.org/D25550



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284379 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed