[Bug c/11373] New: asm generated lhs expressions are discarded

["marcus at jet dot franken dot de" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11373

           Summary: asm generated lhs expressions are discarded
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: marcus at jet dot franken dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu

Attached testcase reduces to f() { return; } instead of generating 
a memory reference: (omit-frame-pointer is not the culprit, breaks with -O2 
too) 
 
gcc -c -O2  -fomit-frame-pointer xx.i ; objdump -d xx.o 
00000000 <f>: 
   0:   c3                      ret 
 
(This is reduced from WINE, TlsSetValue())