Revert "[lldb][DWARFASTParserClang] Make C++ method parsing aware of explicit object parameters" (#124100)

Reverts llvm/llvm-project#124096

Broke linux CI:
```
Note: This is test shard 7 of 42.
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from DWARFASTParserClangTests
[ RUN      ] DWARFASTParserClangTests.TestParseSubroutine_ExplicitObjectParameter
Expected<T> must be checked before access or destruction.
Expected<T> value was in success state. (Note: Expected<T> values in success mode must still be checked prior to being destroyed).
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  SymbolFileDWARFTests 0x0000560271ee5ba7
1  SymbolFileDWARFTests 0x0000560271ee3a2c
2  SymbolFileDWARFTests 0x0000560271ee63ea
3  libc.so.6            0x00007f3e54e5b050
4  libc.so.6            0x00007f3e54ea9e2c
5  libc.so.6            0x00007f3e54e5afb2 gsignal + 18
6  libc.so.6            0x00007f3e54e45472 abort + 211
7  SymbolFileDWARFTests 0x0000560271e79d51
8  SymbolFileDWARFTests 0x0000560271e724f7
9  SymbolFileDWARFTests 0x0000560271f39e2c
10 SymbolFileDWARFTests 0x0000560271f3b368
11 SymbolFileDWARFTests 0x0000560271f3c053
12 SymbolFileDWARFTests 0x0000560271f4cf67
13 SymbolFileDWARFTests 0x0000560271f4c18a
14 SymbolFileDWARFTests 0x0000560271f2561c
15 libc.so.6            0x00007f3e54e4624a
16 libc.so.6            0x00007f3e54e46305 __libc_start_main + 133
17 SymbolFileDWARFTests 0x0000560271e65161
```

0 files changed, 0 insertions, 0 deletions