Do not try to inline if the function has an illegal redeclaration.

test/mjsunit/regress/regress-436896.js

Index: test/mjsunit/regress/regress-436896.js
diff --git a/test/mjsunit/regress/regress-355486.js b/test/mjsunit/regress/regress-436896.js
similarity index 64%
copy from test/mjsunit/regress/regress-355486.js
copy to test/mjsunit/regress/regress-436896.js
index 55362a13416335b72bfa1ff92bc29f7a04edbd65..344a7a3049305a655b74f0ca56ea5ecba3bbf58c 100644
--- a/test/mjsunit/regress/regress-355486.js
+++ b/test/mjsunit/regress/regress-436896.js
@@ -4,10 +4,14 @@
 
 // Flags: --allow-natives-syntax
 
-function f() { var v = arguments[0]; }
-function g() { f(); }
+function f(x) {
+  const x = 0;
+  return x;
+}
+
+function g(x) {
+  return f(x);
+}
 
-g();
-g();
 %OptimizeFunctionOnNextCall(g);
-g();
+assertThrows(function() { g(42); }, TypeError);