(stack_align_edx): New function.
(stack_align_eax): New function.
(main): Add calls to stack_align_edx and stack_align_eax.
* gdb.arch/i386-prologue.exp: Replace stack_align with stack_align_ecx.
Add testing for the cases where the register used during a stack
realignment is edx. Same for eax.
directives to conditionalize symbol prefixing.
* gdb.arch/i386-prologue.exp: Allow symbol prefixing by adding
additional_flags handling. Add underscore prefix for Cygwin.
* gdb.arch/i386-unwind.c: Use preprocessor directives to
conditionalize symbol prefixing.
* gdb.arch/i386-unwind.exp: Allow symbol prefixing by adding
additional_flags handling. Add underscore prefix for Cygwin.
