LoongArch, bpf: Set bpf_jit_bypass_spec_v1/v4()

JITs can set bpf_jit_bypass_spec_v1/v4() if they want the verifier
to skip analysis/patching for the respective vulnerability, it is
safe to set both bpf_jit_bypass_spec_v1/v4(), because there is no
speculation barrier instruction for LoongArch.

Suggested-by: Luis Gerhorst <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
Acked-by: Luis Gerhorst <[email protected]>

Author: seehearfeel

arch/loongarch/net/bpf_jit.c

@@ -1359,3 +1359,13 @@ bool bpf_jit_supports_subprog_tailcalls(void)
 {
 	return true;
 }
+
+bool bpf_jit_bypass_spec_v1(void)
+{
+	return true;
+}
+
+bool bpf_jit_bypass_spec_v4(void)
+{
+	return true;
+}