proc: Continue should always work after CallFunction

Continue did not resume execution after a call to CallFunction if the
point where the process was stopped, before the call CallFunction, was
a breakpoint.

Fixes #1374

_fixtures/issue1374.go

@@ -0,0 +1,12 @@
+package main
+
+import "fmt"
+
+func main() {
+	i := getNum()
+	fmt.Println(i)
+}
+
+func getNum() int {
+	return 0
+}

pkg/proc/proc.go

@@ -281,7 +281,7 @@ func stepInstructionOut(dbp Process, curthread Thread, fnname1, fnname2 string)
 			if g := dbp.SelectedGoroutine(); g != nil {
 				g.CurrentLoc = *loc
 			}
-			return nil
+			return curthread.SetCurrentBreakpoint()
 		}
 	}
 }

pkg/proc/proc_test.go

@@ -4084,3 +4084,20 @@ func TestReadDeferArgs(t *testing.T) {
 		}
 	})
 }
+
+func TestIssue1374(t *testing.T) {
+	// Continue did not work when stopped at a breakpoint immediately after calling CallFunction.
+	protest.MustSupportFunctionCalls(t, testBackend)
+	withTestProcess("issue1374", t, func(p proc.Process, fixture protest.Fixture) {
+		setFileBreakpoint(p, t, fixture, 7)
+		assertNoError(proc.Continue(p), t, "First Continue")
+		assertLineNumber(p, t, 7, "Did not continue to correct location (first continue),")
+		assertNoError(proc.CallFunction(p, "getNum()", &normalLoadConfig, true), t, "Call")
+		err := proc.Continue(p)
+		if _, isexited := err.(proc.ErrProcessExited); !isexited {
+			regs, _ := p.CurrentThread().Registers(false)
+			f, l, _ := p.BinInfo().PCToLine(regs.PC())
+			t.Fatalf("expected process exited error got %v at %s:%d", err, f, l)
+		}
+	})
+}