tree d7cae099a531473714d03d1e4586b7b22a67302c
parent 02b4da53a76b4ba18e3e14588826d7af45ccd6b5
author Colin Cross <ccross@android.com> 1523488218 -0700
committer Colin Cross <ccross@android.com> 1523899928 +0000

Make bpfix not modify the input tree

Make a new object called Fixer to hold the state of the tree, and
make a copy of the input tree so the original doesn't get modified.

Test: bpfix_test.go
Change-Id: I1dc6fd99158c8b0e1db029df99e6cf72699a5e63