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Duncan P. N. Exon Smith c74b2b0974 IR: Don't allow non-default visibility on local linkage

Visibilities of `hidden` and `protected` are meaningless for symbols
with local linkage.

  - Change the assembler to reject non-default visibility on symbols
    with local linkage.

  - Change the bitcode reader to auto-upgrade `hidden` and `protected`
    to `default` when the linkage is local.

  - Update LangRef.

<rdar://problem/16141113>

llvm-svn: 208263

2014-05-07 22:57:20 +00:00

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 ; RUN: not llvm-as < %s -o /dev/null 2>&1 | FileCheck %s
 @var = private protected global i32 0
 ; CHECK: symbol with local linkage must have default visibility