Following test-case ICEs:

$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c -O1 --param ira-max-conflict-table-size=0
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c: In function ‘y’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c:31:5: error: qsort comparator non-negative on sorted output: 1
     }
     ^
during RTL pass: ira
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-prof/pr44777.c:31:5: internal compiler error: qsort checking failed
0x1458639 qsort_chk_error
	../../gcc/vec.c:222
0x1458a01 qsort_chk(void*, unsigned long, unsigned long, int (*)(void const*, void const*))
	../../gcc/vec.c:274
0xa19f60 fast_allocation
	../../gcc/ira-color.c:4821
0xa19f60 ira_color()
	../../gcc/ira-color.c:4899
0x9ffcea ira
	../../gcc/ira.c:5283
0x9ffcea execute
	../../gcc/ira.c:5581