Changed 'optimize_max' for 'optimize' compile option on Chromium

Changed 'optimize_max' for 'optimize' compile option on Chromium

The 'optimize_max' option is not meant to be used by default for
Release builds. These use the 'optimize' config. See comment here
for explanation:
https://cs.chromium.org/chromium/src/build/config/compiler/BUILD.gn?l=1572

Change-Id: I7af8e3e4c7e92c60f38841b75998e2b488a5ffde
Reviewed-on: https://swiftshader-review.googlesource.com/11228
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>