[Compliance-Tests] Condition operators for type bit

[eine]

In VHDL/Compliance-Tests, tests for VHDL 2008 and VHDL 2019 features are being gathered. 18 tests related to conditional operators in VHDL 2008 are defined in a single file (https://github.com/VHDL/Compliance-Tests/blob/master/vhdl_2008/tb_condition_operator.vhd). These features seem to be implemented in GHDL for type std_logic, but not for bit. As a result, compiling the file produces a crash, and all of the tests fail: https://github.com/1138-4EB/Compliance-Tests/commit/76d8f03770003d4f2653342c4f6755156c3aa2a4/checks?check_suite_id=263110591.

By commenting out bit cases (https://github.com/1138-4EB/Compliance-Tests/commit/f415c49cd5a65d4470a3c7878ab01fed0ef77a73) 18 tests pass: https://github.com/1138-4EB/Compliance-Tests/commit/f415c49cd5a65d4470a3c7878ab01fed0ef77a73/checks?check_suite_id=263119021

How to reproduce?

apt update -qq
apt install git
git clone https://github.com/VHDL/Compliance-Tests
cd Compliance-Tests
python3 run.py -v "vhdl_2008.tb_condition_operator.*"

# :image: ghdl/vunit:llvm

Context

If a GHDL Bug occurred block is shown in the log, please paste it here:

internal error: eval_monadic_operator: IIR_PREDEFINED_BIT_CONDITION

******************** GHDL Bug occurred ***************************
Please report this bug on https://github.com/ghdl/ghdl/issues
GHDL release: 0.37-dev (v0.36-1004-g97aee23d) [Dunoon edition]
Compiled with GNAT Version: 8.3.0
Target: x86_64-linux-gnu
/src/
Command line:
/usr/local/bin/ghdl1-llvm --workdir=/src/vunit_out/ghdl/libraries/vhdl_2008 --work=vhdl_2008 --std=08 -P/src/vunit_out/ghdl/libraries/
vunit_lib/ -P/src/vunit_out/ghdl/libraries/vhdl_2008/ -P/src/vunit_out/ghdl/libraries/vhdl_2019/ -P/usr/local/lib/ghdl/ieee/v08/ -P/us
r/local/lib/ghdl/ -c -fpic -o /src/vunit_out/ghdl/libraries/vhdl_2008/tb_condition_operator.o /src/vhdl_2008/tb_condition_operator.vhd
Exception TYPES.INTERNAL_ERROR raised
Exception information:
raised TYPES.INTERNAL_ERROR : vhdl-errors.adb:180
Call stack traceback locations:
0x4b079a 0x4e6c81 0x4eec09 0x4efaf3 0x4f0052 0x545624 0x545b3e 0x545e27 0x54f255 0x55ba47 0x545010 0x52e006 0x52de06 0x52dec8 0x52e141
 0x52ed7c 0x52f254 0x52f593 0x563557 0x56a206 0x5269c2 0x63956e 0x63b170 0x63ca1f 0x409fc1 0x7fdeb6df7099 0x409178 0xfffffffffffffffe
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