[PATCH] D24039: Fixed spill stack objects are mutable

[Krzysztof Parzyszek via llvm-commits]

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CreateFixedSpillStackObject marked the created objects as immutable.  This is an error, since spill stack objects are stored to, while immutable objects are assumed to never change during the function execution.

Repository:
  rL LLVM

https://reviews.llvm.org/D24039

Files:
  include/llvm/CodeGen/MachineFrameInfo.h
  lib/CodeGen/MachineFunction.cpp
  test/CodeGen/Hexagon/fixed-spill-mutable.ll

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