comp: add support for -fdata-sections

src/codegen/llvm.zig

@@ -955,6 +955,7 @@ pub const Object = struct {
                 reloc_mode,
                 code_model,
                 options.function_sections,
+                options.data_sections,
                 float_abi,
                 if (target_util.llvmMachineAbi(options.target)) |s| s.ptr else null,
             );

src/codegen/llvm/bindings.zig

@@ -919,6 +919,7 @@ pub const TargetMachine = opaque {
         Reloc: RelocMode,
         CodeModel: CodeModel,
         function_sections: bool,
+        data_sections: bool,
         float_abi: ABIType,
         abi_name: ?[*:0]const u8,
     ) *TargetMachine;