squash-merge the changes in #4 (i.e. 1e0322a..dd4ccac)
add #include for SSE eintrinsics (amends prev. commit)
rename the function to indicate that it looks for the first match
use the SIMD function for searching EOL as well
*10 the benchmark counter
[optimize] use separate flag to notify the caller if a match was found (and now the performance is in par with #4)
utilize the added flag (in prev commit) in other parts as well
add test for handling of the CTL chars in headers
add test for handling of trailing SP in header name
optimizations using SSE4 (close #5, merge branch 'kazuho/sse4-integration.2')