tests/sksl/runtime/LoopInt.skvm

4 registers, 8 instructions:
0	r0 = uniform32 ptr0 14
1	r1 = uniform32 ptr0 18
2	r2 = uniform32 ptr0 1C
3	r3 = uniform32 ptr0 20
loop:
4	    store32 ptr1 r0
5	    store32 ptr2 r1
6	    store32 ptr3 r2
7	    store32 ptr4 r3