fix parsing of requires in requires

lib/dependencies/CommonJsImportsParserPlugin.js

@@ -254,6 +254,7 @@ class CommonJsImportsParserPlugin {
 				dep.asiSafe = !parser.isAsiPosition(expr.range[0]);
 				dep.loc = expr.callee.loc;
 				parser.state.module.addDependency(dep);
+				parser.walkExpressions(expr.arguments);
 				return true;
 			}
 		};

test/cases/cjs-tree-shaking/parsing/index.js

@@ -0,0 +1,3 @@
+it("should parse nested requires successfully", () => {
+	expect(require("./nested-require").value).toBe(42);
+});

test/cases/cjs-tree-shaking/parsing/module.js

@@ -0,0 +1,2 @@
+exports.fn = a => a + 1;
+exports.value = 41;

test/cases/cjs-tree-shaking/parsing/nested-require.js

@@ -0,0 +1 @@
+exports.value = require("./module").fn(require("./module").value);