Fix mismatched new/free/delete/delete[] in block mgr.
Fix mismatched new/free/delete/delete[] in block mgr.

Change-Id: I7cb03784fe92acd49cf01d6c1b4631db49267bcc
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4542
Reviewed-by: Alex Behm <fe1626037acfc2dc542d2aa723a6d14f2464a20c@cloudera.com>
Tested-by: jenkins

andybab/Impala,placrosse/ImpalaToGo,gistic/PublicSpatialImpala,ImpalaToGo/ImpalaToGo,gistic/PublicSpatialImpala,gistic/PublicSpatialImpala,andybab/Impala,gistic/PublicSpatialImpala,andybab/Impala,placrosse/ImpalaToGo,gistic/PublicSpatialImpala,placrosse/ImpalaToGo,ImpalaToGo/ImpalaToGo,ImpalaToGo/ImpalaToGo,andybab/Impala,placrosse/ImpalaToGo,gistic/PublicSpatialImpala,ImpalaToGo/ImpalaToGo,placrosse/ImpalaToGo,ImpalaToGo/ImpalaToGo,andybab/Impala,ImpalaToGo/ImpalaToGo,placrosse/ImpalaToGo,andybab/Impala