cpu.x86.bootstrap: add safepoint to jit-epilog

basis/cpu/x86/32/bootstrap.factor

@@ -359,6 +359,9 @@ IN: bootstrap.x86
     EAX EDX [] MOV
     jit-jump-quot ;
 
+: jit-safepoint ( -- )
+    0 [] EAX MOV rc-absolute rel-safepoint ;
+
 [
     jit-start-context-and-delete
 ] \ (start-context-and-delete) define-sub-primitive

basis/cpu/x86/64/bootstrap.factor

@@ -313,6 +313,9 @@ IN: bootstrap.x86
     jit-push-param
     jit-jump-quot ;
 
+: jit-safepoint ( -- )
+    0 [RIP+] EAX MOV rc-relative rel-safepoint ;
+
 [
     jit-start-context-and-delete
 ] \ (start-context-and-delete) define-sub-primitive

basis/cpu/x86/bootstrap.factor

@@ -198,6 +198,7 @@ big-endian off
 ] jit-execute jit-define
 
 [
+    jit-safepoint
     stack-reg stack-frame-size bootstrap-cell - ADD
 ] jit-epilog jit-define