Matt Arsenault 707780b420 AMDGPU: Always allocate emergency stack slot at offset 0 ...

This allows us to ensure that 0 is never a valid pointer
to a user object, and ensures that the offset is always legal
without needing a register to access it. This comes at the cost
of usable offsets and wasted stack space.

llvm-svn: 295877

2017-02-22 21:05:25 +00:00

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