DX-105463: Fix LLVM version-specific Optional type and deprecated getPointerTo() API

Author: dmitry-chirkov-dremio

cpp/src/gandiva/engine.cc

@@ -229,7 +229,11 @@ Result<std::unique_ptr<llvm::orc::LLJIT>> BuildJIT(
 #endif
 
   jit_builder.setJITTargetMachineBuilder(std::move(jtmb));
+#if LLVM_VERSION_MAJOR >= 17
+  jit_builder.setDataLayout(std::make_optional(data_layout));
+#else
   jit_builder.setDataLayout(llvm::Optional<llvm::DataLayout>(data_layout));
+#endif
 
   if (object_cache.has_value()) {
     jit_builder.setCompileFunctionCreator(

cpp/src/gandiva/timestamp_ir.cc

@@ -430,7 +430,7 @@ Status TimestampIR::BuildTimezoneWrapper(const std::string& function_name,
 
   auto i64 = types()->i64_type();
   auto i32 = types()->i32_type();
-  auto i8ptr = llvm::Type::getInt8Ty(*context())->getPointerTo();
+  auto i8ptr = types()->i8_ptr_type();
   auto function = BuildFunction(
       function_name, i64, {{"ctx", i64}, {"ts", i64}, {"tz", i8ptr}, {"tz_len", i32}});
   auto entry = llvm::BasicBlock::Create(*context(), "entry", function);
@@ -468,9 +468,9 @@ Status TimestampIR::BuildCastVARCHARWrapper(const std::string& function_name,
 
   auto i64 = types()->i64_type();
   auto i32 = types()->i32_type();
-  auto i8 = llvm::Type::getInt8Ty(*context());
-  auto i8ptr = i8->getPointerTo();
-  auto i32ptr = i32->getPointerTo();
+  auto i8 = types()->i8_type();
+  auto i8ptr = types()->i8_ptr_type();
+  auto i32ptr = types()->i32_ptr_type();
   auto function =
       BuildFunction(function_name, i8ptr,
                     {{"ctx", i64}, {"ts", i64}, {"len", i64}, {"out_len", i32ptr}});