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Added a missing "test" and replaced the "-e" option of the shell-builtin
"test" with "-f". The former is not portable, see autoconf documentation.

Fixes another crash with biographical profiling.

In eval_thunk_selector(), when filling the slop for a closure we've
just updated, we were using the wrong info table.  This bug appears to
have been in 6.6, too.

Fixes a crash I encountered with profiling and -debug

Spiller can now insert spill/reload instrs without having to
worry about the current stack delta. Generation of actual machine
instructions for spills/reloads is deferred until after register
allocation proper.

This is needed in order to write Main_main from pure Cmm.

This order matches the symantic order better since
the GC check is done before the update frame is pushed.

It now matches the order used by the existing codeGen.

See the definition of splitInlineCont for what this is about.
Cures Trac #1627.
Test is simpl017