[PATCH] fix llvm linker issue with dbg.declare

[Bill Wendling]

Hi Manman,

The patch looks okay to me. Please make sure it ran though some of the nightly tests first. Thanks!

-bw

On Jan 28, 2013, at 3:21 PM, Manman Ren <mren at apple.com> wrote:

> 
> Hello,
> 
> Given source IR:
> call void @llvm.dbg.declare(metadata !{i32* %argc.addr}, metadata !14), !dbg !15
> we used to generate 
> call void @llvm.dbg.declare(metadata !27, metadata !28), !dbg !29
> !27 = metadata !{null}
> 
> With this patch, we will generate
> call void @llvm.dbg.declare(metadata !{i32* %argc.addr}, metadata !27), !dbg !28
> 
> Looking up %argc.addr in ValueMap will return null. Since %argc.addr is already
> correctly set up, we can use identity mapping.
> 
> Please review,
> 
> Thanks,
> Manman
> 
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