[PATCH] [Support] Add MemoryBuffer::getFileSlice()

[kledzik at apple.com]

Hi rafael,

mach-o supports "fat" files which are a header/table-of-contents followed by a concatenation of mach-o files of different architectures.   Currently, MemoryBuffer has no easy way to map a subrange (slice) of a file which lld will need to select a mach-o slice of a fat file.  The new function provides an easy way to map a slice of a file into a MemoryBuffer.  Test case included.

http://reviews.llvm.org/D5423

Files:
  include/llvm/Support/MemoryBuffer.h
  lib/Support/MemoryBuffer.cpp
  unittests/Support/MemoryBufferTest.cpp
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