For the lower vrp bound to be 2/-2, unsigned ints must be 4 bytes wide. This
breaks targets like avr. Explicitly using __UINT32_TYPE__ (behind a typedef) 
makes the testcase pass for all targets.

gcc/testsuite/ChangeLog:

2016-09-21  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

	* gcc.dg/tree-ssa/pr64130.c: Use __UINT32_TYPE__ instead of int.

From-SVN: r240300