[libunwind] LIBUNWIND_REMEMBER_HEAP_ALLOC to cmake.

Missed it originally in https://reviews.llvm.org/D85005.

Reviewed By: gargaroff

Differential Revision: https://reviews.llvm.org/D91182

GitOrigin-RevId: e7b8d3776f36beb9b73cd0f7c81fdc4b832b6df3
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d7e13b7..e344263 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,6 +69,7 @@
 option(LIBUNWIND_INCLUDE_DOCS "Build the libunwind documentation." ${LLVM_INCLUDE_DOCS})
 option(LIBUNWIND_IS_BAREMETAL "Build libunwind for baremetal targets." OFF)
 option(LIBUNWIND_USE_FRAME_HEADER_CACHE "Cache frame headers for unwinding. Requires locking dl_iterate_phdr." OFF)
+option(LIBUNWIND_REMEMBER_HEAP_ALLOC "Use heap instead of the stack for .cfi_remember_state." OFF)
 
 set(LIBUNWIND_LIBDIR_SUFFIX "${LLVM_LIBDIR_SUFFIX}" CACHE STRING
     "Define suffix of library directory name (32/64)")
@@ -312,6 +313,10 @@
   add_compile_definitions(_LIBUNWIND_USE_FRAME_HEADER_CACHE)
 endif()
 
+if(LIBUNWIND_REMEMBER_HEAP_ALLOC)
+  add_compile_definitions(_LIBUNWIND_REMEMBER_HEAP_ALLOC)
+endif()
+
 # This is the _ONLY_ place where add_definitions is called.
 if (MSVC)
   add_definitions(-D_CRT_SECURE_NO_WARNINGS)