3.1: Bootstrap comparison failures on alphaev6-unknown-linux-gnu

[Brad Lucier]

> 
> On alphaev6-unknown-linux-gnu, with ../configure and make -j 4 bootstrap,
> I get
> 
> Bootstrap comparison failure!
... 
> varasm.o differs
... among others.

Here are some more details about the bootstrap failure with
varasm.c.

The first substantive comparison difference, beyond things like

varasm.c.00.rtl:
107300c107300
< (note 9 7 11 0x200000a5680 NOTE_INSN_BLOCK_BEG)
---
> (note 9 7 11 0x2000008f680 NOTE_INSN_BLOCK_BEG)


comes in the dump of the gcse pass.  The .i file and gcse dumps of the
stage1 and stage2 compilers on varasm.c can be found at

http://www.math.purdue.edu/~lucier/stage1-varasm.c.09.gcse.gz
http://www.math.purdue.edu/~lucier/stage2-varasm.c.09.gcse.gz
http://www.math.purdue.edu/~lucier/varasm.i.gz

I can't find evidence of a good 3.1 bootstrap on alpha since May 11.

The stage1 compiler was built with gcc-2.95.1.

Brad