[PATCH] Fix thumbv5e stack coloring assertion failure

[Logan Chien]

Hi,

  I found that some code with llvm.lifetime.* intrinsics will raise
assertion failure in Thumb1 backend when stack coloring is enabled.  The
root cause is that we are accessing the stack slot for frame pointer
without checking the existence of the stack slot.  The test cases and the
patch are attached.  Please have a look.  Thanks.

Sincerely,
Logan
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