[SandboxIR] More boilerplate: Function, Argument, Constant, Instruction, OpaqueInst

[vporpo]

A very basic implementation of sandboxir::
Fuction
Argument
Constant
Instruction
OpaqueInst

[aeubanks]

lgtm with comment addressed

[llvm-ci]

LLVM Buildbot has detected a new failure on builder lldb-aarch64-ubuntu running on linaro-lldb-aarch64-ubuntu while building llvm at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/1006

Here is the relevant piece of the build log for the reference:

Step 6 (test) failure: build (failure)
...
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests/1/3 (1980 of 1989)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests/2/3 (1981 of 1989)
PASS: lldb-unit :: tools/lldb-server/tests/./LLDBServerTests/0/2 (1982 of 1989)
PASS: lldb-unit :: tools/lldb-server/tests/./LLDBServerTests/1/2 (1983 of 1989)
PASS: lldb-unit :: Utility/./UtilityTests/0/8 (1984 of 1989)
PASS: lldb-unit :: Utility/./UtilityTests/5/8 (1985 of 1989)
PASS: lldb-unit :: Utility/./UtilityTests/6/8 (1986 of 1989)
PASS: lldb-unit :: Process/gdb-remote/./ProcessGdbRemoteTests/8/10 (1987 of 1989)
PASS: lldb-api :: tools/lldb-server/TestLldbGdbServer.py (1988 of 1989)
TIMEOUT: lldb-api :: functionalities/gdb_remote_client/TestGDBRemoteClient.py (1989 of 1989)
******************** TEST 'lldb-api :: functionalities/gdb_remote_client/TestGDBRemoteClient.py' FAILED ********************
Script:
--
/usr/bin/python3.8 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env ARCHIVER=/usr/local/bin/llvm-ar --env OBJCOPY=/usr/bin/llvm-objcopy --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --arch aarch64 --build-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/dsymutil --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/gdb_remote_client -p TestGDBRemoteClient.py
--
Exit Code: -9
Timeout: Reached timeout of 600 seconds

Command Output (stdout):
--
lldb version 19.0.0git (https://github.com/llvm/llvm-project.git revision d5f5dc9dcca427a290a9f454046113afdb6a68ff)
  clang revision d5f5dc9dcca427a290a9f454046113afdb6a68ff
  llvm revision d5f5dc9dcca427a290a9f454046113afdb6a68ff

--

********************
********************
Timed Out Tests (1):
  lldb-api :: functionalities/gdb_remote_client/TestGDBRemoteClient.py


Testing Time: 667.27s

Total Discovered Tests: 2991
  Unsupported      :  487 (16.28%)
  Passed           : 2480 (82.92%)
  Expectedly Failed:   23 (0.77%)
  Timed Out        :    1 (0.03%)
FAILED: tools/lldb/test/CMakeFiles/check-lldb /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb/test/CMakeFiles/check-lldb 
cd /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb/test && /usr/bin/python3.8 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/llvm-lit -v /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb/test
ninja: build stopped: subcommand failed.