Check in testcases that were just in my tree

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3023 91177308-0d34-0410-b5e6-96231b3b80d8

test/CFrontend/2002-02-18-StaticData.c

@@ -0,0 +1,11 @@
+
+double FOO = 17;
+double BAR = 12.0;
+float XX = 12.0f;
+
+static char *procnames[] = {
+  "EXIT"
+};
+
+void *Data[] = { &FOO, &BAR, &XX };
+

test/CFrontend/2002-04-09-StructRetVal.c

@@ -0,0 +1,10 @@
+struct S {
+  int i;
+  short s1, s2;
+};
+
+struct S func_returning_struct(void);
+
+void loop(void) {
+  func_returning_struct();
+}

test/CFrontend/2002-05-24-Alloca.c

@@ -0,0 +1,9 @@
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv) {
+	char *C = (char*)alloca(argc);
+	strcpy(C, argv[0]);
+	puts(C);
+}