cleanup patch for tree-profiling branch

[Kenneth Zadeck]

This patch fixes three problems:

1) I had Volatile asms allowed in pure and constant functions.
2) I had allowed loops to be in pure functions.
3) We were failing gcc/testsuite/gcc.dg/tree-ssa/ssa-dce-2.c because it 
	expects const function detection at -O1. (I changed it to -O2)

tested on i686 suse

======================gcc/Changelog.profiling

 2004-12-07  Kenneth Zadeck  <Kenneth.Zadeck@NaturalBridge.com>
    * ipa-static-vars-anal.c (get_asm_expr_operands): keep any function
        with volatile asm from being marked const or pure.
    (static_execute): turn off pure if the function contains backedges.


======================gcc/testsuite/Changelog.profiling

2004-12-07  Kenneth Zadeck  <Kenneth.Zadeck@NaturalBridge.com>
    * gcc.dg/tree-ssa/ssa-dce-2.c: Changed to -O2 since analysis for
    const functions no longer done at -O1
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