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45 Merge branch cache-playground (r23-r30 and r34-r44) into trunk

This primarily adds the following features the the processor:
- A direct-mapped instruction cache with configurable cache line width and
number of cache lines.
- Various bug fixes for bugs that appeared when the processor could run
instructions at full speed but had to stall for data.
- A "Hello World" test application.		 skordal 3300d 23h /potato/trunk/
36 Ensure correct read of CSR after stall skordal 3301d 01h /potato/trunk/
35 Prevent jumping/branching when stalling skordal 3301d 01h /potato/trunk/
34 Prevent flushing the pipeline if it is stalling skordal 3301d 01h /potato/trunk/
28 Add rudimentary User's manual skordal 3314d 22h /potato/trunk/
26 Prevent exceptions from being taken while stalling

Jumping to an exception handler while stalling and waiting for a load/store
instruction to finish can cause undefined results from the load/store
instruction. This actually fixes the issue mentioned in revision r20.		 skordal 3315d 03h /potato/trunk/
24 Remove unused STRINGIFY macros skordal 3317d 20h /potato/trunk/
22 Fix the potato_get_badvaddr() macro skordal 3317d 21h /potato/trunk/
21 Upgrade the example design to use a 60 MHz system clock skordal 3317d 21h /potato/trunk/
20 Fix SHA256 benchmark crash by storing all registers on exception handler entry

This problem will disappear when the processor is updated to conform to the
new supervisor specification, which will allow us to use a compiler that
conforms to the new "official" ABI.		 skordal 3317d 21h /potato/trunk/
19 SHA256 benchmark: allow compiler to inline at will skordal 3317d 21h /potato/trunk/
18 instr_misalign_check: add do_jump to sensitivity list skordal 3319d 21h /potato/trunk/
17 Improve detection of unaligned instructions skordal 3324d 04h /potato/trunk/
16 Correct grammar in source code comment skordal 3324d 04h /potato/trunk/
15 SHA256 benchmark: fix Makefile syntax error skordal 3330d 21h /potato/trunk/
14 Improve detection of invalid instructions skordal 3330d 22h /potato/trunk/
13 Add SHA256 benchmark code skordal 3331d 02h /potato/trunk/
12 Update example design with correct bug-report URL and testbenches skordal 3331d 04h /potato/trunk/
11 Correct FIFO file header skordal 3331d 05h /potato/trunk/
10 Add missing FIFO module skordal 3335d 23h /potato/trunk/
9 Remove dependency on a non-existent target in the Makefile skordal 3335d 23h /potato/trunk/
8 Clarify instruction ROM naming in the example design README skordal 3343d 01h /potato/trunk/
7 Add test design for the Nexys 4 board from Digilent skordal 3343d 01h /potato/trunk/
6 Add ISA tests skordal 3343d 01h /potato/trunk/
5 Update the README, remove .md extension skordal 3345d 07h /potato/trunk/
4 Add license skordal 3345d 07h /potato/trunk/
3 Fix bug reporting URL skordal 3345d 07h /potato/trunk/
2 Initial commit skordal 3345d 09h /potato/trunk/
1 The project and the structure was created root 3356d 12h /potato/trunk/

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