[clang] [Clang] Fix the mangling of lambdas (PR #89204)

[Aaron Ballman via cfe-commits]

================
@@ -538,6 +538,7 @@ Bug Fixes to C++ Support
 - Fix a crash in requires expression with templated base class member function. Fixes (#GH84020).
 - Fix a crash caused by defined struct in a type alias template when the structure
   has fields with dependent type. Fixes (#GH75221).
+- Fix the Itanium mangling of lambdas defined in a member of a local class (#GH88906)
----------------
AaronBallman wrote:

@rjmccall do you think this should come with an ABI tag to get the old mangling behavior?

https://github.com/llvm/llvm-project/pull/89204