Rename HBranch (the instruction that coerces an arbitrary HValue to
control flow) to HTest to free up the term Branch to refer to any
control instruction with two successors.

Change the virtual FirstSuccessor and SecondSuccessor functions on
control instructions to a pair of data members.

Review URL: http://codereview.chromium.org/6366002

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Review URL: http://codereview.chromium.org/6369005

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Review URL: http://codereview.chromium.org/6374002

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Implement ConstantD and ConstantI.

BUG=1048

Review URL: http://codereview.chromium.org/6262005

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The result can be a register, a stack slot or a constant operand.

Right now it is only used for enviroment uses.

Review URL: http://codereview.chromium.org/6348003

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Currently only closures which only read from the context are supported.

Review URL: http://codereview.chromium.org/5753005

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This instruction does not produce a result. We don't need a result
LOperand for it.

Review URL: http://codereview.chromium.org/6306001

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Small tweaks to make X64 compliant.
A few UNIMPLEMENTED left, but most empty functions call Abort to bail out.

Review URL: http://codereview.chromium.org/6201006

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Crankshaft: Move LEnvironment and LPointerMap classes to platform-independent lithium.h.  Move WriteTranslation method from LEnvironment class to LCodeGen class.
Review URL: http://codereview.chromium.org/6142011

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Review URL: http://codereview.chromium.org/6128008

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Review URL: http://codereview.chromium.org/6132002

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Review URL: http://codereview.chromium.org/6121001

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Review URL: http://codereview.chromium.org/6118002

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Review URL: http://codereview.chromium.org/6015014

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Remove uses of NearestGapPos in splitting helpers. We can split at any position.

Review URL: http://codereview.chromium.org/5605004

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