libbpf: Move insn_is_pseudo_func() to libbpf_internal.h

Currently, insn_is_pseudo_func() is only used in libbpf.c, move it
to libbpf_internal.h so that it can be used in test_verifier, this
is preparation for later patch.

Suggested-by: Song Liu <song@kernel.org>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

tools/lib/bpf/libbpf.c

@@ -748,11 +748,6 @@ static bool is_call_insn(const struct bpf_insn *insn)
 	return insn->code == (BPF_JMP | BPF_CALL);
 }
 
-static bool insn_is_pseudo_func(struct bpf_insn *insn)
-{
-	return is_ldimm64_insn(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
-}
-
 static int
 bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog,
 		      const char *name, size_t sec_idx, const char *sec_name,

tools/lib/bpf/libbpf_internal.h

@@ -532,6 +532,11 @@ static inline bool is_ldimm64_insn(struct bpf_insn *insn)
 	return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
 }
 
+static inline bool insn_is_pseudo_func(struct bpf_insn *insn)
+{
+	return is_ldimm64_insn(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
+}
+
 /* if fd is stdin, stdout, or stderr, dup to a fd greater than 2
  * Takes ownership of the fd passed in, and closes it if calling
  * fcntl(fd, F_DUPFD_CLOEXEC, 3).