[stack]: Don't collect stack alignment on error_mark_node

["H.J. Lu" <hjl dot tools at gmail dot com>]

When expand_one_var tried to collect stack alignment on error_mark_node,
it crashed:

./xgcc -B./ /export/gnu/src/gcc-stack-test/gcc/gcc/testsuite/gcc.dg/gomp/pr35751.c
-S -fopemp
cc1: error: unrecognized command line option "-fopemp"
gnu-6:pts/13[35]> ./xgcc -B./
/export/gnu/src/gcc-stack-test/gcc/gcc/testsuite/gcc.dg/gomp/pr35751.c
-S -fopenmp
/export/gnu/src/gcc-stack-test/gcc/gcc/testsuite/gcc.dg/gomp/pr35751.c:
In function 'foo':
/export/gnu/src/gcc-stack-test/gcc/gcc/testsuite/gcc.dg/gomp/pr35751.c:8:
error: object with variably modified type must have no linkage
/export/gnu/src/gcc-stack-test/gcc/gcc/testsuite/gcc.dg/gomp/pr35751.c:8:
error: storage size of 'a' isn't constant
/export/gnu/src/gcc-stack-test/gcc/gcc/testsuite/gcc.dg/gomp/pr35751.c:9:
error: storage size of 'b' isn't constant
/export/gnu/src/gcc-stack-test/gcc/gcc/testsuite/gcc.dg/gomp/pr35751.c:29:
internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in expand_one_var, at cfgexpand.c:773
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

I am checking in the enclosed patch to fix it.


H.J.
---
2008-04-21  H.J. Lu  <hongjiu.lu@intel.com>

        * cfgexpand.c (expand_one_var): Don't collect stack alignment
        on error_mark_node.

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