regressions tests for PR103770

This adds tests from bugzilla for PR103770 and duplicates.

gcc/testsuite/
	* gcc.dg/pr103770.c: New test.
	* gcc.dg/pr103859.c: New test.
	* gcc.dg/pr105065.c: New test.

gcc/testsuite/gcc.dg/pr103770.c

@@ -0,0 +1,27 @@
+/* PR middle-end/103770 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+struct struct_s {
+	void* ptr;
+	void* ptr2;
+	void* ptr3;
+};
+
+struct struct_s struct_create(int N, const long vla[N]);
+
+void fun(int N)
+{
+	long vla[N];
+	struct struct_s st = struct_create(N, vla);
+}
+
+
+extern _Complex float g(int N, int dims[N]);
+
+void f(void)
+{
+ 	int dims[1];
+	_Complex float val = g(1, dims);
+}
+

gcc/testsuite/gcc.dg/pr103859.c

@@ -0,0 +1,23 @@
+/* PR middle-end/103859 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+typedef struct dcmplx dcmplx;
+
+struct dcmplx {
+  double re;
+  double im;
+};
+
+dcmplx horner(int n, dcmplx p[n], dcmplx x);
+
+int main(void)
+{
+  int i, n;
+  dcmplx x[n + 1], f[n + 1];
+
+  horner(n + 1, f, x[i]);
+
+  return 0;
+}
+

gcc/testsuite/gcc.dg/pr105065.c

@@ -0,0 +1,16 @@
+/* PR middle-end/105065 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+typedef struct
+{
+	char filler[17];
+} big_struct;
+
+big_struct dummy(int size, char array[size]);
+
+int main()
+{
+	dummy(0, 0);
+}
+