[PR42782] preserve nonaddressable MEMs at calls in VTA

[Alexandre Oliva]

When processing call insns, VTA drops all MEMs from location lists, save
for those that claim to *be* the variable, in their MEM_EXPRs.

This is a bit excessive.  MEMs referencing variables that are not
call-clobbered could also be retained.  This patch implements this.

I had to include tree-flow.h for the static inline definition of
is_call_clobbered() that it brings in from tree-flow-inline.h, and then
dump_variable in var-tracking conflicted with the declaration in the
header file, that refers to an incompatible definition in another file.
So I renamed the conflicting definition.

Regstrapping on x86_64-linux-gnu.  Ok if it succeeds?

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-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer