ld failure introduced with pr797 patch

[Alan Modra]

Hi HJ,
  I believe your fix for PR797 is to blame for a ld problem which can be
demonstrated by building binutils for tic30-unknown-coff and running the
ld testsuite.  I see "+FAIL: check sections 1".  The linker script has

.const :
{
        *(.const)
        __etext = . ;
} > rom
.mdata : AT( ADDR(.const) + SIZEOF(.const) )
{
        __data = . ;
        *(.data);
        __edata = . ;
} > ram

.const is empty, so fails to have its output_section_statement fully
initialized.  This results in "nonconstant expression for load base".

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre