[add changelog entries]

Author: kinke

CHANGELOG.md

@@ -2,12 +2,15 @@
 
 #### Big news
 - Frontend, druntime and Phobos are at version [2.111.0+](https://dlang.org/changelog/2.111.0.html). (#4877, #4910, #4918)
+- Support for [LLVM 20](https://releases.llvm.org/20.1.0/docs/ReleaseNotes.html). The prebuilt packages use v20.1.5. (#4843, #4911, #4935)
+  - The dynamic-compile (JIT) feature has regressed with LLVM 20. Use LLVM 18 or 19 for that feature.
 - Keep frame pointers by default with `-O` for some targets, notably AArch64 (except Windows), x86_64 (except Windows and glibc Linux), Windows x86, and Android. This fixes druntime backtraces with optimized code (incl. prebuilt druntime/Phobos). (#4889)
 - The prebuilt (non-musl) Linux packages are now generated on Ubuntu 22.04; the minimum glibc version has accordingly been raised from v2.31 to v2.35. (#4893)
 - ldc2.conf: Arrays can now be appended to via the `~=` operator. (#4848, #4856)
 - New `--installWithSuffix` command-line option for the `ldc-build-runtime` tool, to simplify copying the libraries to an existing LDC installation. (#4870)
 
 #### Platform support
+- Supports LLVM 15 - 20.
 
 #### Bug fixes