I don't know how much is this related to PR43494. This one is failing with
-fselective-scheduling2 and with different target. Also it started failing just
few revisions ago.

Compiler output:
$ cd gcc/testsuite/gcc.dg/compat
$ gcc -O2 -fselective-scheduling2 scalar-by-value-3_main.c
scalar-by-value-3_x.c scalar-by-value-3_y.c
$ ./a.out 

(fails with -O[23s])

Tested revisions:
r164228 - fail
r163636 - fail
r161659 - OK

Reduced testcase to follow.

           Summary: [4.6 Regression] gcc.dg/compat/scalar-by-value-3 FAILs
                    with -O2 -fselective-scheduling2
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


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