This adds a release note entry for the new -mframe-chain option
introduced on D125094.
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D129085
* Implemented generation of Windows SEH unwind information.
* Switched the MinGW target to use SEH instead of DWARF for unwind information.
* Added support for the Cortex-M85 CPU.
+* Added support for a new -mframe-chain=(none|aapcs|aapcs+leaf) command-line
+ option, which controls the generation of AAPCS-compliant Frame Records.
Changes to the AVR Backend
--------------------------