[PATCH] Reverse order in which base and derived pointers are lowered in the statepoint StackMap section

[Igor Laevsky]

Hi reames, AndyAyers, swaroop.sridhar, pgavlin, sanjoy,

According to the documentation in StackMap section for the statepoint we should have:

```
The first Location in each pair describes the base pointer for the object. The second is the derived pointer actually being relocated.
```

But actually in the code we emit them in reverse order - derived pointer first, base pointer second.

This change fixes this problem and updates test cases to check ordering.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9527

Files:
  lib/CodeGen/SelectionDAG/StatepointLowering.cpp
  test/CodeGen/X86/statepoint-stack-usage.ll
  test/CodeGen/X86/statepoint-stackmap-format.ll

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