[vta] fix two thinkos in expand_debug_expr()

[Alexandre Oliva]

EXPAND_INITIALIZER implies EXPAND_CONST_ADDR, and it's not a bitmask.
I'm still a bit amazed that this actually worked for a while ;-)

In a conversion, taking the mode from the expansion of the operand,
rather than from what we might expect at first, guarantees that we
will perform a conversion if one is needed.  Without this, we failed
bootstrap-debug assertions on i686-pc-linux-gnu.

Installing in the vta branch.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
FSF Latin America Board Member         http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}