feat(ascendc): add Huawei Ascend C toolchain support

Add toolchain, language, rules, and compiler modules for the
bisheng compiler driver from CANN (Compute Architecture for
Neural Networks) toolkit. Supports .asc (Ascend C kernel) and
.aicpu (AI-CPU operator) source kinds with binary/static/shared
target types.

- Toolchain: SDK auto-detection via ASCEND_HOME_PATH env or --sdk
- Compiler: bisheng module inherits from clang, adds add_sourceflags
  for explicit sourcekind overrides
- Rules: ascendc.env (default C++17), npuarchs (--npu-arch), build
- Language: check_main detection, add_ascnpuarchs API
- Tests: unit tests for check_main, project tests for libs/mixed

Fixes #7506

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/projects/ascendc/libs/src/lib.asc b/tests/projects/ascendc/libs/src/lib.asc
new file mode 100644
index 000000000..c0e0dad5d
--- /dev/null
+++ b/tests/projects/ascendc/libs/src/lib.asc
@@ -0,0 +1,5 @@
+#include "kernel_operator.h"
+
+__global__ __vector__ void hello_world() {
+    AscendC::printf("[Block (%lu/%lu)]: Hello World!!!\n", AscendC::GetBlockIdx(), AscendC::GetBlockNum());
+}