Verilator 4.100 2020-09-07 released

[wsnyder]

Verilator 4.100 2020-09-07 released

Major:

• C++11 or newer compilers are now required.
• SystemC 2.3.0 or newer (SYSTEMC_VERSION >= 20111121) is now required.
• Support hierarchical Verilation (Hierarchical verilation using protect lib verilator#2206). [Yutetsu TAKATSUKASA]

Other:

• Support (with limitations) class extern, class extends, virtual class.
• Support $urandom, $urandom_range without stability.
• Fix false DECLFILENAME on black-boxed modules (Lint: DECLFILENAME warning is picking up a blackboxed module inside the actual module verilator#2430). [Philipp Wagner]
• Fix naming of "id : begin" blocks.
• Fix class constructor error on assignments to const.
• Fix splitting eval functions with --output-split-cfuncs (Split _eval when it grows large verilator#2368). [Geza Lo$
• Fix queues as class members (Queue within classes verilator#2525). [nanduraj1]
• Add support for assume property. [Peter Monsson]