[lldb][test] Remove duplicate testcase names in API test-suite (#97043)

In one of my recent PRs I mistakenly had two test-cases with the same
name, preventing one of them to run. Since it's an easy

[lldb][test] Remove duplicate testcase names in API test-suite (#97043)

In one of my recent PRs I mistakenly had two test-cases with the same
name, preventing one of them to run. Since it's an easy mistake to make
(e.g., copy pasting existing test-cases), I ran following sanity-check
script over `lldb/test/API`, which found couple of tests which were
losing coverage because of this (or in some cases simply had duplicate
tests):
```
import ast
import sys

filename = sys.argv[1]
print(f'Checking {filename}...')
tree = ast.parse(open(filename, 'r').read())

for node in ast.walk(tree):
if not isinstance(node, ast.ClassDef):
continue

func_names = []
for child in ast.iter_child_nodes(node):
if isinstance(child, ast.FunctionDef):
func_names.append(child.name)

seen_func_names = set()
duplicate_func_names = []
for name in func_names:
if name in seen_func_names:
duplicate_func_names.append(name)
else:
seen_func_names.add(name)

if len(duplicate_func_names) != 0:
print(f'Multiple func names found:\n\t{duplicate_func_names}\n\tclass {node.name}\n\tfile: {filename}')
```

This patch fixes these cases.

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[lldb][Tests] Reformat API tests with black

These are all recent additions I think, including a few of mine
for AArch64.

Going forward the CI checks should help us fix these earlier.

[lldb] Add basic support to Rust enums in TypeSystemClang

LLDB doesn't yet have a TypeSystemRust implemented however it is used to debug Rust applications. Most of the types map well enough to Clang

[lldb] Add basic support to Rust enums in TypeSystemClang

LLDB doesn't yet have a TypeSystemRust implemented however it is used to debug Rust applications. Most of the types map well enough to Clang types and there are python formatters implemented to display those types reasonably well in a debugger.

However, Rust enums are completely ignored by LLDB as Clang never emits DW_TAG_variant_part inside DW_TAG_structure_type

This diff adds a parser for DW_TAG_variant_part (Rust-only) that creates a matching valid Clang declaration to the Rust enum. As long as there is enough information and all fields have correct offsets synthetic/summary providers can be implemented to display it correctly when debugging Rust code

Differential Revision: https://reviews.llvm.org/D149213

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