[clang] Retrieve BinaryOperator::getOpcode and BinaryOperator::getOpcodeStr via libclang and its python interface (PR #98489)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Thank you for picking this back up! Hopefully @Endilll can comment on the python bits, but the changes generally LGTM aside from some very minor nits. One thing that should be added is a release note (in `clang/docs/ReleaseNotes.rst` so users know about the new functionality.

Precommit CI did find a relevant failure to address though:
```
FAIL: Clang :: Index/index-concepts.cpp (12051 of 20439)
******************** TEST 'Clang :: Index/index-concepts.cpp' FAILED ********************
Exit Code: 1
Command Output (stdout):
--
# RUN: at line 1
c:\ws\src\build\bin\c-index-test.exe -test-load-source all C:\ws\src\clang\test\Index\index-concepts.cpp -std=gnu++20 -fno-delayed-template-parsing | c:\ws\src\build\bin\filecheck.exe C:\ws\src\clang\test\Index\index-concepts.cpp
# executed command: 'c:\ws\src\build\bin\c-index-test.exe' -test-load-source all 'C:\ws\src\clang\test\Index\index-concepts.cpp' -std=gnu++20 -fno-delayed-template-parsing
# note: command had no output on stdout or stderr
# executed command: 'c:\ws\src\build\bin\filecheck.exe' 'C:\ws\src\clang\test\Index\index-concepts.cpp'
# .---command stderr------------
# | C:\ws\src\clang\test\Index\index-concepts.cpp:44:11: error: CHECK: expected string not found in input
# | // CHECK: index-concepts.cpp:[[@LINE-3]]:29: BinaryOperator= Extent=[[[@LINE-3]]:29 - [[@LINE-3]]:62]
# |           ^
# | <stdin>:494:118: note: scanning from here
# | // CHECK: index-concepts.cpp:40:17: TemplateTypeParameter=T:40:17 (Definition) Extent=[40:11 - 40:18] [access=public]
# |                                                                                                                      ^
# | <stdin>:494:118: note: with "@LINE-3" equal to "41"
# | // CHECK: index-concepts.cpp:40:17: TemplateTypeParameter=T:40:17 (Definition) Extent=[40:11 - 40:18] [access=public]
# |                                                                                                                      ^
# | <stdin>:494:118: note: with "@LINE-3" equal to "41"
# | // CHECK: index-concepts.cpp:40:17: TemplateTypeParameter=T:40:17 (Definition) Extent=[40:11 - 40:18] [access=public]
# |                                                                                                                      ^
# | <stdin>:494:118: note: with "@LINE-3" equal to "41"
# | // CHECK: index-concepts.cpp:40:17: TemplateTypeParameter=T:40:17 (Definition) Extent=[40:11 - 40:18] [access=public]
# |                                                                                                                      ^
# | <stdin>:495:11: note: possible intended match here
# | // CHECK: index-concepts.cpp:41:29: BinaryOperator=&& Extent=[41:29 - 41:62]
# |           ^
# |
# | Input file: <stdin>
# | Check file: C:\ws\src\clang\test\Index\index-concepts.cpp
# |
# | -dump-input=help explains the following input dump.
# |
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |           489: // CHECK: index-concepts.cpp:38:15: FunctionDecl=sizeFunc:38:15 (Definition) Extent=[38:1 - 38:39]
# |           490: // CHECK: index-concepts.cpp:38:26: CompoundStmt= Extent=[38:26 - 38:39]
# |           491: // CHECK: index-concepts.cpp:38:28: ReturnStmt= Extent=[38:28 - 38:36]
# |           492: // CHECK: index-concepts.cpp:38:35: IntegerLiteral= Extent=[38:35 - 38:36]
# |           493: // CHECK: index-concepts.cpp:41:9: ConceptDecl=ConWithLogicalAnd:41:9 (Definition) Extent=[40:1 - 41:62]
# |           494: // CHECK: index-concepts.cpp:40:17: TemplateTypeParameter=T:40:17 (Definition) Extent=[40:11 - 40:18] [access=public]
# | check:44'0                                                                                                                          X error: no match found
# | check:44'1                                                                                                                            with "@LINE-3" equal to "41"
# | check:44'2                                                                                                                            with "@LINE-3" equal to "41"
# | check:44'3                                                                                                                            with "@LINE-3" equal to "41"
# |           495: // CHECK: index-concepts.cpp:41:29: BinaryOperator=&& Extent=[41:29 - 41:62]
# | check:44'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | check:44'4               ?                                                                   possible intended match
# |           496: // CHECK: index-concepts.cpp:41:29: ConceptSpecializationExpr= Extent=[41:29 - 41:36]
# | check:44'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           497: // CHECK: index-concepts.cpp:41:29: TemplateRef=Con1:31:9 Extent=[41:29 - 41:33]
# | check:44'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           498: // CHECK: index-concepts.cpp:41:34: TypeRef=T:40:17 Extent=[41:34 - 41:35]
# | check:44'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           499: // CHECK: index-concepts.cpp:41:40: BinaryOperator=> Extent=[41:40 - 41:62]
# | check:44'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           500: // CHECK: index-concepts.cpp:41:40: UnaryExpr= Extent=[41:40 - 41:49]
# | check:44'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             .
# |             .
# |             .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1
--
********************
```

https://github.com/llvm/llvm-project/pull/98489