Make LLVMToSPIRVBase comply with Rule of Five. (#2860)

LLVMToSPIRVBase had a custom destructor, but no copy constructor, no move constructor, no move assignment operator, and no copy assignment operator, so it was not complying with the Rule of Five. Explicitly add them as deleted to comply.

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@93fb018aa342da1

Author: maarquitos14

llvm-spirv/lib/SPIRV/SPIRVWriter.h

@@ -72,6 +72,10 @@ namespace SPIRV {
 class LLVMToSPIRVBase : protected BuiltinCallHelper {
 public:
   LLVMToSPIRVBase(SPIRVModule *SMod);
+  LLVMToSPIRVBase(const LLVMToSPIRVBase &Other) = delete;
+  LLVMToSPIRVBase &operator=(const LLVMToSPIRVBase &Other) = delete;
+  LLVMToSPIRVBase(LLVMToSPIRVBase &&Other) = delete;
+  LLVMToSPIRVBase &operator=(LLVMToSPIRVBase &&Other) = delete;
   bool runLLVMToSPIRV(Module &Mod);
 
   // This enum sets the mode used to translate the value which is