[Issue 20441] Wrong code with -O -fPIC and string literal.ptr

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20441

--- Comment #3 from Don <clugdbug at yahoo.com.au> ---

And here is what the optimizer produces. The problematic instruction is
highlighted.

   0x000055555558dbe8 <+0>:   push   %rbp
   0x000055555558dbe9 <+1>:   mov    %rsp,%rbp
   0x000055555558dbec <+4>:   lea    0x31d6d(%rip),%rdi        # 0x5555555bf960
   0x000055555558dbf3 <+11>:  callq  0x55555558dbdc <_moo>
=> 0x000055555558dbf8 <+16>:  sub    $0x31d66,%rax
   0x000055555558dbfe <+22>:  jne    0x55555558dc04 <_Dmain+28>
   0x000055555558dc00 <+24>:  xor    %eax,%eax
   0x000055555558dc02 <+26>:  pop    %rbp
   0x000055555558dc03 <+27>:  retq 


The mistake is that the addressing mode flag to make it RIP-relative, is
missing.
Instead of

sub    RAX, [RIP + 0x31d66]

it is generating

sub    RAX, [0x31d66]

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