Repro for missing predecessor with try/catch

Found when running the compiler on a large swath of internal code. 
PruneMaybeThrows rewrites terminals, but the logic to update subsequent phis was 
incorrectly dropping phis rather than rewriting them. Fixed in the next PR.

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.expect.md

@@ -0,0 +1,28 @@
+
+## Input
+
+```javascript
+// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions
+function useSupportsTouchEvent() {
+  return useMemo(() => {
+    if (checkforTouchEvents) {
+      try {
+        document.createEvent("TouchEvent");
+        return true;
+      } catch {
+        return false;
+      }
+    }
+  }, []);
+}
+
+```
+
+
+## Error
+
+```
+Cannot read properties of undefined (reading 'preds')
+```
+          
+      

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.js

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+// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions
+function useSupportsTouchEvent() {
+  return useMemo(() => {
+    if (checkforTouchEvents) {
+      try {
+        document.createEvent("TouchEvent");
+        return true;
+      } catch {
+        return false;
+      }
+    }
+  }, []);
+}