[λ] Add test for function expr passed to jsx

Function exprs become frozen when captured by jsx.

compiler/forget/src/__tests__/fixtures/hir/capture-func-passed-to-jsx.expect.md

@@ -0,0 +1,70 @@
+
+## Input
+
+```javascript
+function component(a, b) {
+  let y = { b };
+  let z = { a };
+  let x = function () {
+    z.a = 2;
+    y.b;
+  };
+  let t = <Foo x={x}></Foo>;
+  mutate(x); // x should be frozen here
+  return t;
+}
+
+```
+
+## Code
+
+```javascript
+function component(a, b) {
+  const $ = React.useMemoCache();
+  const c_0 = $[0] !== b;
+  let y;
+  if (c_0) {
+    y = { b: b };
+    $[0] = b;
+    $[1] = y;
+  } else {
+    y = $[1];
+  }
+  const c_2 = $[2] !== a;
+  let z;
+  if (c_2) {
+    z = { a: a };
+    $[2] = a;
+    $[3] = z;
+  } else {
+    z = $[3];
+  }
+  const c_4 = $[4] !== z.a;
+  const c_5 = $[5] !== y.b;
+  let x;
+  if (c_4 || c_5) {
+    x = function () {
+      z.a = 2;
+      y.b;
+    };
+    $[4] = z.a;
+    $[5] = y.b;
+    $[6] = x;
+  } else {
+    x = $[6];
+  }
+  const c_7 = $[7] !== x;
+  let t;
+  if (c_7) {
+    t = <Foo x={x}></Foo>;
+    $[7] = x;
+    $[8] = t;
+  } else {
+    t = $[8];
+  }
+  mutate(x);
+  return t;
+}
+
+```
+      

compiler/forget/src/__tests__/fixtures/hir/capture-func-passed-to-jsx.js

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+function component(a, b) {
+  let y = { b };
+  let z = { a };
+  let x = function () {
+    z.a = 2;
+    y.b;
+  };
+  let t = <Foo x={x}></Foo>;
+  mutate(x); // x should be frozen here
+  return t;
+}