Was merged in #144 then again in #141.

Summary: adding <stdexcept> to testchip_tsi.cc

Support multi-thread VCS simv option like FGP, Xprof etc.

testchip_tsi.cc throws an exception defined in <stdexcept> without it being
defined. add the missing import

Switch to the target thread when `htif` `idle`s. This enables continual execution of the target even if htif isn't working correctly.

Convert fire() to fire

Generalize CanHaveTraceIOModuleImp to mix in with LazyRawModuleImp

remove cloneType

Move ROM base to 0x10040

update for latest chisel, remove toBool and chisel3.core.

Report failing mmap in mm_t

Compilation of the VCS simulator failed with the complains related
to `throw std::invalid_argument()`. Addition of the <stdexcept>
resolves the issue.

in firesim/firesim#764 MIDAS-level simulation has been timing out.  This
is being caused by uninitialized value of clock_hz.  In general all
non-static data members should be given default member initializers
to guard against cases like this where several of the constructor
signatures of mm_dramsim2_t fail to initialize clock_hz.

Co-authored-by: Tim Snyder <snyder.tim@gmail.com>

Fix clock domain/device name of periphery scratchpad

Add TLROM which sits alongside the external serial memory

Test chip features