Per code review:
  - Main loop in the pixman_fill_buff16_mips routine now uses 4-byte writes
  - Added alignment check to ensure that we don't encounter unaligned write 
with the sw instruction (pixman_fill_buff16_mips)
  - Added lowlevel-blt-bench results (src_n_0565/src_n_8888) in the log message.

Benchmark results (lowlevel-blt-bench) on Malta board (@1Ghz):
Referent:
              src_n_0565 =  L1: 238.14  L2: 233.15  M: 57.88 ( 77.23%)  HT: 
53.22  VT: 49.99  R: 47.73  RT: 24.79 (  91Kops/s)
              src_n_8888 =  L1: 190.19  L2: 187.57  M: 28.94 ( 77.23%)  HT: 
27.91  VT: 27.33  R: 26.64  RT: 14.68 (  77Kops/s)
Previous commit (with the 2-byte stores for pixman_fill_buff16_mips):
              src_n_0565 =  L1: 718.59  L2: 245.10  M:236.82 (315.64%)  HT: 
58.08  VT: 52.38  R: 51.62  RT: 24.56 (  90Kops/s)
              src_n_8888 =  L1: 694.35  L2: 113.36  M:133.68 (356.36%)  HT: 
39.00  VT: 37.14  R: 34.88  RT: 15.77 (  79Kops/s)
Optimized (with the 4-byte stores for pixman_fill_buff16_mips)
              src_n_0565 =  L1:1081.39  L2: 258.22  M:189.59 (252.91%)  HT: 
60.23  VT: 55.01  R: 53.44  RT: 23.68 (  89Kops/s)
              src_n_8888 =  L1: 653.46  L2: 113.55  M:135.26 (360.86%)  HT: 
38.99  VT: 37.38  R: 34.95  RT: 18.67 (  84Kops/s)

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