[EmitC] Adapt lit tests to emitc.funcs default dialect #14912

Job	Run time
setup / setup	8s
Build Packages / Linux Release (x86_64)	15m 12s
Test AMD MI300 / test_mi300	1m 52s
Regression Test / test_regression_suite :: cpu_llvm_task	10m 11s
Regression Test / test_models :: cpu_llvm_task	4m 29s
Regression Test / test_regression_suite :: amdgpu_rocm_mi250_gfx90a	9m 30s
Test AMD MI250 / test_mi250	5m 6s
Regression Test / test_models :: amdgpu_rocm_mi250_gfx90a	7m 16s
Test AMD W7900 / test_w7900	1m 49s
Regression Test / test_regression_suite :: amdgpu_rocm_mi300_gfx942	6m 16s
Regression Test / test_models :: amdgpu_rocm_mi300_gfx942	2m 45s
Regression Test / test_models :: amdgpu_vulkan	1m 36s
Test Android / android_arm64	5m 59s
Test ONNX / test_onnx_ops :: cpu_llvm_sync	4m 15s
Test ONNX / test_onnx_models :: cpu_llvm_task	3m 4s
Test ONNX / test_onnx_ops :: amdgpu_rocm_rdna3	8m 55s
Test RISC-V 64 / riscv64	5m 20s
Test ONNX / test_onnx_ops :: amdgpu_vulkan	1m 45s
Test TensorFlow / Linux (x86_64)	1m 22s
Unit Test / Linux (x86_64)	2m 40s
	1h 39m 30s

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