[Bug target/58595] internal compiler error: in gen_movsi when compiling on arm some files of lttng-tools with -fPIE

["meadori at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58595

--- Comment #3 from Meador Inge <meadori at codesourcery dot com> ---
As shown in the backtrace, the ICE occurs when GCSE tries generate a move.
The the following asserts fire in 'gen_movsi':

  gcc_assert (GET_CODE (tmp) == SYMBOL_REF);                                
  gcc_assert (SYMBOL_REF_TLS_MODEL (tmp) != 0);

This is because the move operands look like:

  (gdb) p debug_rtx(operands[0])
  (reg/f:SI 115)

  (gdb) p debug_rtx(operands[1])
  (mem/u/c:SI (plus:SI (reg:SI 111)
          (unspec:SI [
                  (symbol_ref:SI ("state") [flags 0x90] <var_decl 0xf7c50114
state>)
              ] UNSPEC_PIC_SYM)) [0  S4 A32])

We aren't expecting the 'mem' expression with the TLS reference in side.

I am not sure if this is just an overzealous assert or we have a deeper
issue.  Removing the asserts does allow the code to compile.