Fix broken gcc.dg/torture/pr80341.c for avr

This patch skips pr80341.c for targets with int size less than 32 bits.
The assertion in the testcase holds only if sizeof(int) > sizeof(short), 
which isn't true for smaller int size targets like the avr.

gcc/testsuite

2017-04-19  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

	* gcc.dg/torture/pr80341.c: Require int32plus.

From-SVN: r246994