The performance data for PEI phase should be collected from pre-memory, so move PERF_START macro to correct place.
The performance data for PEI phase should be collected from pre-memory, so move PERF_START macro to correct place.

git-svn-id: 5648d1bec6962b0a6d1d1b40eba8cf5cdb62da3d@2015 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2