read-tree -m A B: prime cache-tree from the switched-to tree
read-tree -m A B: prime cache-tree from the switched-to tree

When switching to a new branch with "read-tree -m A B", the resulting
index must match tree B and we can prime the cache tree with it.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git