[PATCH, i386]: Fix PR target/43528: Wrong assert in ix86_expand_prologue for TARGET_STACK_PROBE

[Uros Bizjak]

Hello!

There really is no reason to have this assert in ix86_expand_prologue. 
The compilation works without problems when assert is removed and the 
result looks sane for both -m32 and -m64 (you have to
provide your own __chkstk for -mstack-arg-probe, of course).

2010-03-26  Uros Bizjak <ubizjak@gmail.com>

     PR target/43524
     * config/i386/i386.c (ix86_expand_prologue) [TARGET_STACK_PROBE]:
     Remove invalid assert and wrong comment.

testsuite/ChangeLog:

2010-03-26  Uros Bizjak <ubizjak@gmail.com>

     PR target/43524
     * gcc.target/i386/pr43524.c: New test.

Tested on x86_64-pc-linux-gnu {,-m32}, committed to mainline. The patch 
will be backported to 4.4 and 4.3 in a couple of days.

Uros.
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