[lldb] [scripting bridge] 167388 chore: add api to return arch name for target (#168273)

This pr fixes #167388 .

## Description

This pr adds new method `GetArchName` to `SBTarget` so that no need to
parse triple to get arch name in client code.

## Testing

### All from `TestTargetAPI.py`

run test with

```
./build/bin/lldb-dotest -v -p TestTargetAPI.py
```
<details>
<summary>existing tests (without newly added)</summary>
<img width="1425" height="804" alt="image"
src="https://github.com/user-attachments/assets/617e4c69-5c6b-44c4-9aeb-b751a47e253c"
/>
</details>

<details>
<summary>existing tests (with newly added)</summary>
<img width="1422" height="778" alt="image"
src="https://github.com/user-attachments/assets/746990a1-df88-4348-a090-224963d3c640"
/>

</details>

### Only `test_get_arch_name`

run test with 
```
./build/bin/lldb-dotest -v -p TestTargetAPI.py -f test_get_arch_name_dwarf -f test_get_arch_name_dwo -f test_get_arch_name_dsym lldb/test/API/python_api/target

```
<details>
<summary>only newly added</summary>
<img width="1422" height="778" alt="image"
src="https://github.com/user-attachments/assets/fcaafa5d-2622-4171-acee-e104ecee0652"
/>
</details>

---------

Signed-off-by: Nikita B <n2h9z4@gmail.com>
Co-authored-by: Jonas Devlieghere <jonas@devlieghere.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/lldb/test/API/python_api/target/TestTargetAPI.py b/lldb/test/API/python_api/target/TestTargetAPI.py
index d346563af18e..d3c64d87375b 100644
--- a/lldb/test/API/python_api/target/TestTargetAPI.py
+++ b/lldb/test/API/python_api/target/TestTargetAPI.py
@@ -105,6 +105,24 @@ class TargetAPITestCase(TestBase):
         self.assertIsNotNone(data_section2)
         self.assertEqual(data_section.name, data_section2.name)
 
+    def test_get_arch_name(self):
+        d = {"EXE": "b.out"}
+        self.build(dictionary=d)
+        self.setTearDownCleanup(dictionary=d)
+        target = self.create_simple_target("b.out")
+
+        arch_name = target.arch_name
+        self.assertTrue(len(arch_name) > 0, "Got an arch name")
+
+        # Test consistency with triple.
+        triple = target.triple
+        self.assertTrue(len(triple) > 0, "Got a triple")
+        self.assertEqual(
+            triple.split("-")[0],
+            arch_name,
+            "Arch name is equal to the first item of the triple",
+        )
+
     def test_get_ABIName(self):
         d = {"EXE": "b.out"}
         self.build(dictionary=d)