Summary: current clang_analyze path is broken, update it
Test Plan:
USE_CLANG=1 TEST_TMPDIR=/dev/shm/rocksdb OPT=-g make J=64 analyze -j64
make sure it works
Reviewers: yiwu, sdong, andrewkr
Reviewed By: andrewkr
Subscribers: andrewkr, dhruba
Differential Revision: https://reviews.facebook.net/D59505