Fix bogus failure of uninit-19.c for avr

Fix bogus failure of uninit-19.c for avr

The test fails for avr because fn1 does not get inlined into fn2. Inlining
occurs for x86_64 because fn1's computed size equals call_stmt_size. For the
avr, 32 bit memory moves are more expensive, and b[3] = p10[a] results in
a bigger size for fn1, preventing the inlining.

Add -finline-small-functions to force early inliner to inline fn1.

gcc/testsuite/
2016-11-23  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

	* gcc.dg/uninit-19.c: Add -finline-small-functions for avr.

From-SVN: r242742