[PATCH] fix llvm linker issue with dbg.declare

[Manman Ren]

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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