* Build AsyncResetSynchronizerShiftReg from new SynchronizerPrimitive

* SyncResetSychronizer: Construct out of single bit shift regs

* ShiftReg: Add comment to distinguish types

* Synchronizers: Refactor how the SynchronizerShiftReg are done internally

* Synchronizers: no longer allow specification of reset value

* Synchronizers: remove some redundant withReset

* Synchronizers: update interrupt crossings to deal with the requirement that async crossings are truly async and marked with SynchronizerPrimitiveShiftReg

* AsyncQueue: only use synchronizers of a fixed depth

* Synchronizers: Add initial values back to the API

* Debug Synchronizers: revert change now that initialization is back in the API

* synchronizers: fix typo in parameter ordering, restore some additional API

* Crossing: deprecate instead of delete the heavily used IntSyncCrossingSink API for asynchronous interrupt crossings

* Synchronizers: fix the postfixing of the primitive

* Allow SynchronizerShiftReg to have a special case of 0 where we just assign out to in

* Allow SyncResetSynchronizerShiftReg to have a special case of 0 where we just assign out to in

* Synchronizer: don't touch the ports so that the primitive I/O is predictable even when data is constant

* travis: bump to python3-pexpect since gdbserver.py was bumped to python3

* Revert "travis: bump to python3-pexpect since gdbserver.py was bumped to python3"

This reverts commit 74ae7576cf643259de3227eacb0ac4f644361be2.

* Synchronizer: workaround for a chisel bug to keep I/O names stable

* Revert "Synchronizer: don't touch the ports so that the primitive I/O is predictable even when data is constant"

This reverts commit a9e83e42222e9ba5e616a408a09123f1fa10a39f.

Co-authored-by: Ryan Macdonald <rmac@sifive.com>

BundleMap: improved API for user bits

Multiplier: Make MultiplierIO clone-able

Support for versioning in diplomacy (old userbits)

BaseSubsystem: Rename attach method and traits

Trying to resolve warning:

[deprecated] class freechips.rocketchip.rocket.MultiplierIO (1 calls): Unable to automatically infer cloneType on class freechips.rocketchip.rocket.MultiplierIO: constructor has parameters (dataBits, tagBits) that are not both immutable and accessible. Either make all parameters immutable and accessible (vals) so cloneType can be inferred, or define a custom cloneType method.
[warn] There were 1 deprecated function(s) used. These may stop compiling in a future release - you are encouraged to fix these issues.
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- Field unification can be customized and defaults to equality required
- Bulk assignment of BundleMaps now uses defaults for missing fields
- You must now define both a Field and Key class

* Revert "updating README examples with Make changes (#2322)"

This reverts commit 875dcd3e.

* Revert "fixing aspect generation (#2309)"

This reverts commit bbeb2578.

* Revert "separate generator behavior into phases (#2274)"

This reverts commit 9d997506.

Grabbed changes from commit: e81dd8b2

prci: allow configurable ClockGroupDriver drive function

Qualify load and store watchpoints by instruction type

*  assertion for speculative fetch chicken bit

* removed the assertion as it may fail due to race condtion

APBToTL: Qualify address alignment assertion

in particular, handle the common failure scenario where an L1 DCache is added to a design with no cacheable memory region.