GHC 8.4 build failure on ARM

Using the same environment I used to build 8.6 and got the following error:

ghc-stage1: panic! (the 'impossible' happened)
  (GHC version 8.4.4.20181014 for arm-unknown-linux):
        padLiveArgs -- i > regNum ??
CallStack (from HasCallStack):
  error, called at compiler/llvmGen/LlvmCodeGen/Base.hs:194:27 in ghc:LlvmCodeGen.Base

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

rts/ghc.mk:295: recipe for target 'rts/dist/build/HeapStackCheck.o' failed
make[1]: *** [rts/dist/build/HeapStackCheck.o] Error 1
make[1]: *** Waiting for unfinished jobs....

Trac metadata

Trac field	Value
Version	8.4.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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Blocking
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changed weight to 5

added Tbug Trac import labels

added ghc build failure label

This is a duplicate of #15780 (closed) and is fixed in with %8.6.2.

added LLVM backend label

marked this issue as related to #15780 (closed)

closed

added Pnormal label