smp: Fix up x86 trampoline TLB clearing to use non clobbered register
diff --git a/common/sys/smp_trampoline.asm_x86 b/common/sys/smp_trampoline.asm_x86
index 928b315c..6b00f1d1 100644
--- a/common/sys/smp_trampoline.asm_x86
+++ b/common/sys/smp_trampoline.asm_x86
@@ -169,8 +169,8 @@ parking64:
.out:
; Clear TLB
- mov rax, cr3
- mov cr3, rax
+ mov rbx, cr3
+ mov cr3, rbx
mov rsp, qword [rdi + 8]
push 0
