[PATCH] [IR/AsmWriter] Output escape sequences if the first character isdigit()

[Filipe Cabecinhas]

- [IR/AsmWriter] Output escape sequences if the first character isdigit()

printMetadataIdentifier now actually starts with a lowercase letter


http://reviews.llvm.org/D10079

Files:
  docs/LangRef.rst
  lib/IR/AsmWriter.cpp
  lib/IR/LLVMContext.cpp
  test/Feature/metadata.ll

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