[llvm] Orc: Compute the JIT DataLayout from the triple and ABI (PR #226316)

[Jan Patrick Lehr via llvm-commits]

jplehr wrote:

```
FAILED: unittests/ExecutionEngine/Orc/OrcJITTests 
: && /usr/bin/c++ -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter ....

/usr/bin/ld: unittests/ExecutionEngine/Orc/CMakeFiles/OrcJITTests.dir/OrcCAPITest.cpp.o: undefined reference to symbol '_ZNK4llvm15MCTargetOptions10getABINameEv'
/usr/bin/ld: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/build/llvm.build/lib/libLLVMMC.so.24.0git: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
```
One of our buildbots is unhappy with this change for the same reason it seems.

https://github.com/llvm/llvm-project/pull/226316