[Bug rtl-optimization/119174] [15 Regression] IRA allocating value live across a call to call clobbered register

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119174

--- Comment #11 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Andrew.  You're missing the point.  This scenario isn't the kind of thing that
reload and LRA are supposed to fix.  They fix constraint problems.  ie, I got
the wrong kind of register (wrong register file), or I can't really handlea 
constant, so reload the value into a register, etc.

We have a pseudo live across a call and IRA allocates that pseudo to a call
clobbered hard register.  That's an IRA bug in my book.