Add instructions for building d8 binary
Add instructions for building d8 binary

R=nednguyen@google.com

Review URL: https://codereview.appspot.com/252190043 .

danbeam/catapult,danbeam/catapult,sahiljain/catapult,benschmaus/catapult,benschmaus/catapult,catapult-project/catapult-csm,modulexcite/catapult,catapult-project/catapult,zeptonaut/catapult,modulexcite/catapult,catapult-project/catapult,benschmaus/catapult,danbeam/catapult,benschmaus/catapult,dstockwell/catapult,catapult-project/catapult,dstockwell/catapult,modulexcite/catapult,SummerLW/Perf-Insight-Report,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,benschmaus/catapult,0x90sled/catapult,0x90sled/catapult,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,zeptonaut/catapult,sahiljain/catapult,catapult-project/catapult-csm,danbeam/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,catapult-project/catapult,scottmcmaster/catapult,scottmcmaster/catapult,catapult-project/catapult-csm,sahiljain/catapult,scottmcmaster/catapult,zeptonaut/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,0x90sled/catapult,dstockwell/catapult,sahiljain/catapult,sahiljain/catapult,catapult-project/catapult,catapult-project/catapult,dstockwell/catapult