Update README.md

Get rid of the second exit block, as suggested by Ilya Albrecht.

[doc] Add the firefox trace, and rewrite a few sentences.

[doc] Add a chart with pointer alignment.

[doc] Update the graph with the reduced code of the nop function.

[bench] Add the nop function to measure the benchmark overhead.

[doc] Label the benchmark charts.

[doc] Update the font in the memcpy chart.

[doc] Update the benchmark charts.

[memcpy] small speedups to the memcpy w/ alignment and TH selection.

[memcpy] Space the reads and writes for the 32-64 section.

[doc] resize the memset chart.

[doc] Add the two benchmarks for memset and memcmp

Fix the label on the benchmark.

Add memcpy libc to the benchmark