Drop unused CLVer member

Its use was removed in dff07df ("[SPIRV] Fix assertion due to
duplicate operands in opencl version metadata. This happens when two
SPIR modules are linked together. Remove check for OCL version in
OCLTypeToSPIRV. Only check if language is C or C++.", 2015-12-16).

Author: svenvh

llvm-spirv/lib/SPIRV/OCLTypeToSPIRV.cpp

@@ -58,8 +58,7 @@ namespace SPIRV {
 
 char OCLTypeToSPIRV::ID = 0;
 
-OCLTypeToSPIRV::OCLTypeToSPIRV()
-    : ModulePass(ID), M(nullptr), Ctx(nullptr), CLVer(0) {
+OCLTypeToSPIRV::OCLTypeToSPIRV() : ModulePass(ID), M(nullptr), Ctx(nullptr) {
   initializeOCLTypeToSPIRVPass(*PassRegistry::getPassRegistry());
 }
 

llvm-spirv/lib/SPIRV/OCLTypeToSPIRV.h

@@ -71,7 +71,6 @@ class OCLTypeToSPIRV : public ModulePass {
 private:
   Module *M;
   LLVMContext *Ctx;
-  unsigned CLVer;
   std::map<Value *, Type *> AdaptedTy; // Adapted types for values
   std::set<Function *> WorkSet;        // Functions to be adapted