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When playing silence, many samples are small enough that squaring them
results in a denormal float. On some AMD CPUs this results in significantly
reduced performance.

This patch configures the SSE floating point environment to flush
denormals and to treat denormals as zero.

Bug: 531026
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: If3842a22f6dc9bef76d87b0a6db069c3f9234d19
Reviewed-on: https://chromium-review.googlesource.com/1179361
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584220}