YJIT: Save PC and SP before calling leaf builtins

test/ruby/test_yjit.rb

@@ -1042,6 +1042,22 @@ def foo
     RUBY
   end
 
+  def test_bug_19316
+    n = 2 ** 64
+    # foo's extra param and the splats are relevant
+    assert_compiles(<<~'RUBY', result: [[n, -n], [n, -n]])
+      def foo(_, a, b, c)
+        [a & b, ~c]
+      end
+
+      n = 2 ** 64
+      args = [0, -n, n, n-1]
+
+      GC.stress = true
+      [foo(*args), foo(*args)]
+    RUBY
+  end
+
   private
 
   def code_gc_helpers

yjit/src/codegen.rs

@@ -5181,6 +5181,10 @@ fn gen_send_iseq(
         if builtin_argc + 1 < (C_ARG_OPNDS.len() as i32) {
             asm.comment("inlined leaf builtin");
 
+            // Save the PC and SP because the callee may allocate
+            // e.g. Integer#abs on a bignum
+            jit_prepare_routine_call(jit, ctx, asm);
+
             // Call the builtin func (ec, recv, arg1, arg2, ...)
             let mut args = vec![EC];