8263376: CTW (Shenandoah): assert(mems <= 1) failed: No node right after call if multiple mem projections

Reviewed-by: kvn, chagedorn

Author: rwestrel

src/hotspot/share/opto/loopnode.cpp

@@ -5042,7 +5042,8 @@ Node *PhaseIdealLoop::get_late_ctrl( Node *n, Node *early ) {
             for (uint j = 1; j < s->req(); j++) {
               Node* in = s->in(j);
               Node* r_in = r->in(j);
-              if ((worklist.member(in) || in == mem) && is_dominator(early, r_in)) {
+              // We can't reach any node from a Phi because we don't enqueue Phi's uses above
+              if (((worklist.member(in) && !in->is_Phi()) || in == mem) && is_dominator(early, r_in)) {
                 LCA = dom_lca_for_get_late_ctrl(LCA, r_in, n);
               }
             }

test/hotspot/jtreg/gc/shenandoah/compiler/TestBadRawMemoryAfterCall.java

@@ -23,7 +23,7 @@
 
 /**
  * @test
- * @bug 8258393
+ * @bug 8258393 8263376
  * @summary Shenandoah: "graph should be schedulable" assert failure
  * @requires vm.flavor == "server"
  * @requires vm.gc.Shenandoah
@@ -38,13 +38,17 @@ public static void main(String[] args) {
         B b = new B();
         C c = new C();
         for (int i = 0; i < 20_000; i++) {
-            test(a);
-            test(b);
-            test(c);
+            test1(a);
+            test1(b);
+            test1(c);
+
+            test2(a, i);
+            test2(b, i);
+            test2(c, i);
         }
     }
 
-    private static Object test(A a) {
+    private static Object test1(A a) {
         if (a.getClass() == A.class) {
         }
 
@@ -58,6 +62,25 @@ private static Object test(A a) {
         return o;
     }
 
+    static int field;
+
+    private static Object test2(A a, int i) {
+        if (a.getClass() == A.class) {
+        }
+
+        Object o = null;
+        try {
+            a.m();
+            o = a.getClass();
+        } catch (Exception e) {
+            i = 42;
+        }
+        if (i == 42) {
+            field = 42;
+        }
+        return o;
+    }
+
     private static class A {
         void m() throws Exception {
             throw new Exception();