[PATCH] Don't build switch lookup tables for dllimport or TLS variables

[Hans Wennborg]

Hi rnk, majnemer,

We would previously put dllimport variables in switch lookup tables, which doesn't work because the address cannot be used in a constant initializer. This is basically the same problem that we have in PR19955.

Putting TLS variables in switch tables also desn't work, because the address of such a variable is not constant.

http://reviews.llvm.org/D4220

Files:
  include/llvm/IR/Constant.h
  lib/IR/Constants.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
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