[Bug target/49798] .quad instead of .long is used for address for x32

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49798

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> 2011-07-21 15:53:56 
UTC ---
IRA generates

(insn 13 3 18 2 (set (reg/v:DI 21 xmm0 [orig:63 v ] [63])
        (mem/u/c/i:DI (symbol_ref/u:DI ("*.LC0") [flags 0x2]) [0 S8 A64]))
x.i:12 62 {*movdi_internal_rex64}
     (expr_list:REG_EQUIV (symbol_ref:DI ("xxxx") [flags 0x40]  <var_decl
0x7f4068bbc140 xxxx>)
        (nil)))

This requires zero-extending 32bit address to 64bit.