add bpf_passthrough generation

tests/c-form/struct_field_tests.bpf.c

@@ -4,9 +4,33 @@
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+/*
+Information gained from reversing this (multiple kernel versions):
+There is no point of
+```llvm
+ tail call void @llvm.dbg.value(metadata ptr %0, metadata !60, metadata !DIExpression()), !dbg !70
+ ```
+ and the first argument of passthrough is fucking useless. It just needs to be a distinct integer:
+ ```llvm
+   %9 = tail call ptr @llvm.bpf.passthrough.p0.p0(i32 3, ptr %8)
+ ```
+*/
+
 SEC("tp/syscalls/sys_enter_execve")
 int handle_setuid_entry(struct trace_event_raw_sys_enter *ctx) {
-  bpf_printk("args: %u", (unsigned int)ctx->args[0]);
+  // Access each argument separately with clear variable assignments
+  unsigned long arg0 = ctx->args[0];
+  bpf_printk("args[0]: %u", arg0);
+
+  unsigned long arg1 = ctx->args[1];
+  bpf_printk("args[1]: %u", arg1);
+
+  // Remove the duplicate access to args[1]
+
+  unsigned long arg2 = ctx->args[2];
+  bpf_printk("args[3]: %u", arg2);
+  bpf_printk("args[4]: %u", ctx->args[2]);
+
   return 0;
 }