PowerPC: Unsupported relocation against x0

On PowerPC/Linux, the perf build is failing for the file compiler/cmm/PprC.hs with a large number of errors like:

tmp/ghc29102_0/ghc_3.s:310927:0: error:
     Error: unsupported relocation against x0

tmp/ghc29102_0/ghc_3.s:310938:0: error:
     Error: unsupported relocation against x0

tmp/ghc29102_0/ghc_3.s:310959:0: error:
     Error: unsupported relocation against x0

All of the above error lines are of the form:

stwu    x0, 1 ,  13

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (CodeGen)
Test case
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Blocking
CC
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PowerPC: Unsupported relocation against x0