Fix failing overflow-1.c for avr

The test assumes 32 bit ints, and expects a constant in the
dump that is only valid for 32 bit ints. Fix by explicitly
specifying __UINT32_TYPE__.

gcc/testsuite/

2017-03-21  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

	* gcc.dg/tree-ssa/overflow-1.c: Use __UINT32_TYPE__ for targets
	with sizeof(int) < 4.

From-SVN: r246318

gcc/testsuite/ChangeLog

+2017-03-21  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>
+
+	* gcc.dg/tree-ssa/overflow-1.c: Use __UINT32_TYPE__ for targets
+	with sizeof(int) < 4.
+
 2017-03-21  Martin Liska  <mliska@suse.cz>
 
 	* gcc.target/i386/pr65044.c: Add '.' in order to catch

gcc/testsuite/gcc.dg/tree-ssa/overflow-1.c

 /* { dg-do compile } */
 /* { dg-options "-O -fdump-tree-optimized" } */
 
-int f(unsigned a){
-    unsigned b=5;
-    unsigned c=a-b;
+#if __SIZEOF_INT__ < 4
+  __extension__ typedef __UINT32_TYPE__ uint32_t;
+#else
+  typedef unsigned uint32_t;
+#endif
+
+int f(uint32_t a){
+    uint32_t b=5;
+    uint32_t c=a-b;
     return c>a;
 }
-int g(unsigned a){
-    unsigned b=32;
-    unsigned c=a+b;
+int g(uint32_t a){
+    uint32_t b=32;
+    uint32_t c=a+b;
     return c<a;
 }