[Bug middle-end/66334] cleanup block fails to initialize EBX

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66334

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Run-time testcases are nptl/tst-cancelx4.c and nptl/tst-cancelx5.c
in glibc when compiled with -fPIE -pie on Linux/x86.