Rename pprof to jeprof.

This rename avoids installation collisions with the upstream gperftools.
Additionally, jemalloc's per thread heap profile functionality
introduced an incompatible file format, so it's now worthwhile to
clearly distinguish jemalloc's version of this script from the upstream
version.

This resolves #229.

Bug: 21326736
(cherry picked from commit 7041720ac208fa2f7f65e40d8133d4b291516847)

Change-Id: I0cfab6aa588cd7e1a830d94f28ee17a8a6a68d98
7 files changed