Enabling tree->rtl to generate (plus for asm() operands at O0

[Mike Stump <mrs at apple dot com>]

I'm trying to get:

void foo() {
  int rowfraclo[2];
  rowfraclo[1] = 42;
  asm ("movd mm6, %a0" : : "p" (rowfraclo+1));
}

to generate:

        movd mm6, -4(%ebp)

at -O0.  Currently we generate:

  leal    -8(%ebp), %eax
  addl    $4, %eax
  movd mm6, (%eax)

With the below patch (still running the testsuite) I can get the  
compiler to generate that code.  So, the question is how better can I  
do this?

Attachment: t.diffs.txt
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