[llvm-commits] [PATCH 6/10] Fix name clash when emitting TOC entries for PowerPC64

[Adhemerval Zanella]

Current TOC entry name creation fails when a .ll file contains an symbol
that clash with the entry's name. For instance, if a .ll file contains 
the definition:

@.LC0 = internal global [5 x i8] c".LC0\00"

And also generates a TOC entry, it will fail saying the symbol name can
not be defined twice.

This patch address this issue by checking if the symbol already exists
and incrementing the TOC counter if so (I didn't add any overflow check
because 'TOCLabelID' is a uint64_t). I also added a test to check the
name clash generation by creating two TOC entry like name and checking
its name generation.

-- 
Adhemerval Zanella Netto
  Software Engineer
  Linux Technology Center Brazil
  Toolchain / GLIBC on Power Architecture
  azanella at linux.vnet.ibm.com / azanella at br.ibm.com
  +55 61 8642-9890

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