i386: Allow "lea foo@GOT, %reg" in PIC
    
    "lea foo@GOT, %reg" is OK in PIC since it only loads the GOT offset
    into register, which can be used later with a GOT base register to
    get the value in the GOT entry.
    
    (cherry picked from commit 2a5684011edabf5804abb9e11253a9747587b284)
    
    bfd/
    
    	PR ld/21168
    	* elf32-i386.c (elf_i386_relocate_section): Allow
    	"lea foo@GOT, %reg" in PIC.
    
    ld/
    
    	PR ld/21168
    	* testsuite/ld-i386/i386.exp: Run pr21168.
    	* testsuite/ld-i386/pr21168a.c: New file.
    	* testsuite/ld-i386/pr21168b.S: Likewise.