Subzero: Remove the IceV_RegManager enum value.

Subzero: Remove the IceV_RegManager enum value.

This hasn't been used in a very long time, and there's no intention of using it again.

Originally there was the idea of a "fast" block-local register allocator for an O1-like configuration, which would allocate registers for infinite-weight temporaries during target lowering, using a "local register manager".  This verbose option was for tracing execution of this register manager.  However, by now it seems unlikely that this would do a better/faster job than the current Om1 register allocation approach, which reuses the linear-scan code quite effectively and does very well at separation of concerns.  So adios IceV_RegManager!

BUG= none
R=jvoung@chromium.org

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=769be681993b128a4898af2fba56f2135f921ecf

[Jim Stichnoth, 2015-01-15 14:13:27]

stichnot@chromium.org changed reviewers:
+ jvoung@chromium.org

[jvoung (off chromium), 2015-01-15 16:16:34]

lgtm

[Jim Stichnoth, 2015-01-15 17:05:17]

Committed patchset #1 (id:1) manually as
769be681993b128a4898af2fba56f2135f921ecf (tree was closed).