Refinements to filesystem and mmap#981

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ting-yuan wants to merge 9 commits intoemscripten-core:incomingfrom

ting-yuan:incoming

Commits on Mar 20, 2013

Put preloaded files on HEAP instead of another ArrayBuffers.
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Add checks to existences of Module['setStatus'].
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Specialize Array/TypedArray in allocate() to avoid unnecessary array constructions.
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1. mmap(): Make use of files that is backed by HEAP.
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Commits on Apr 15, 2013

Assert that MAP_SHARED is only specified with files backed by HEAP.
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mmap(): Align to malloc's default alignment instead of pages.
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Commits on Apr 16, 2013

Unleash the 4k alignment of mmap() in the test_mmap().
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Commits on Apr 17, 2013

Make a temporary variable local.
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Commits on Apr 22, 2013

Conform to coding conventions.
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