[Mono-devel-list] SSA fix

[Massimiliano Mantione]

With this fix IronPython's parrotbench runs fine with -O=all :-)
(plus my previous SSAPRE patch of course).

What it does is forcing the creation of a new variable if the
SSA_STORE operation is performed on an argument, even if the
SSA renaming stack is empty and we are in the entry BB.

Ciao,
  Massi

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