Add some more cfi directives
With some gcc versions, without these directives, unwind does
not work or gives strange entries in stack traces.

Patch from Matthias Schwarzott 



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15247 a5019735-40e9-0310-863c-91ae7b9d1cf9
3 files changed