In MemoryBuffer::getOpenFile() make sure that the buffer is null-terminated if the caller requested a null-terminated one.
In MemoryBuffer::getOpenFile() make sure that the buffer is null-terminated if
the caller requested a null-terminated one.

When mapping the file there could be a racing issue that resulted in the file being larger
than the FileSize passed by the caller. We already have an assertion
for this in MemoryBuffer::init() but have a runtime guarantee that
the buffer will be null-terminated, so do a copy that adds a null-terminator.

Protects against crash of rdar://11161822.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@154082 91177308-0d34-0410-b5e6-96231b3b80d8

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