Pass type when creating load

This makes load generation compatible with opaque pointers.

The generation of nontemporal copies still accesses the pointer
element type, as fixing this requires more movement.

compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs

@@ -20,7 +20,7 @@ pub fn insert_reference_to_gdb_debug_scripts_section_global(bx: &mut Builder<'_,
         // LLVM to keep around the reference to the global.
         let indices = [bx.const_i32(0), bx.const_i32(0)];
         let element = bx.inbounds_gep(gdb_debug_scripts_section, &indices);
-        let volative_load_instruction = bx.volatile_load(element);
+        let volative_load_instruction = bx.volatile_load(bx.type_i8(), element);
         unsafe {
             llvm::LLVMSetAlignment(volative_load_instruction, 1);
         }