Add Mppa target and runtime

Create a new Mppa compilation target for MLIR. This target is the
first one to implement the ahead of time offloading of tensors on device.

Create a new Mppa runtime derived from AcceleratorDevice. The runtime
can be configured on various aspect (check MppaConfig class). Execution
is supported on ISS, Qemu, and Hardware.

Note: In order to use the Mppa target, the Kalray Core Toolchain must be
installed. mlir_sdist and mlir_mppa must also be installed.

Author: ElectrikSpace

Makefile

@@ -56,6 +56,9 @@ check-lit-c:
 check-lit-nvgpu:
 	[ `uname -s` = Darwin ] || env XTC_MLIR_TARGET=nvgpu lit -v tests/filecheck/backends tests/filecheck/mlir_loop tests/filecheck/evaluation
 
+check-lit-mppa:
+	env XTC_MLIR_TARGET=mppa lit -v -j 1 tests/filecheck/backends/target_mppa
+
 check-pytest:
 	scripts/pytest/run_pytest.sh -v