Fix the issue in PeiCore that doesn’t handle Unix style file path of PDB file.
Fix the issue in PeiCore that doesn’t handle Unix style file path of PDB file.

Signed-off-by: lgao4
Reviewed-by:rsun3

git-svn-id: 5648d1bec6962b0a6d1d1b40eba8cf5cdb62da3d@12906 6f19259b-4bc3-4df7-8a09-765794883524

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