panic: getPredTyDescription EqPred [7.0 regression]

Lots of tests are panicing with "getPredTyDescription EqPred". They all seem to be failing the profasm way only. Here's a few:

=====> InstEqContext(profasm) 68 of 130 [0, 0, 0]
cd . && '/64playpen/simonmar/nightly/HEAD-cam-04-unx/x86_64-unknown-linux/inplace/bin/ghc-stage2' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts  -c InstEqContext.hs -O -prof -auto-all -fasm   >InstEqContext.comp.stderr 2>&1
Compile failed (status 256) errors were:
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.1.20110627 for x86_64-unknown-linux):
        getPredTyDescription EqPred

=====> InstEqContext3(profasm) 1796 of 2819 [1, 9, 0]
cd ./indexed-types/should_compile && '/64playpen/simonmar/nightly/HEAD-cam-04-unx/x86_64-unknown-linux/inplace/bin/ghc-stage2' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts  -c InstEqContext3.hs -O -prof -auto-all -fasm   >InstEqContext3.comp.stderr 2>&1
Compile failed (status 256) errors were:
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.1.20110627 for x86_64-unknown-linux):
	getPredTyDescription EqPred

=====> T2238(profasm) 1804 of 2819 [1, 10, 0]
cd ./indexed-types/should_compile && '/64playpen/simonmar/nightly/HEAD-cam-04-unx/x86_64-unknown-linux/inplace/bin/ghc-stage2' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts  -c T2238.hs -O -prof -auto-all -fasm   >T2238.comp.stderr 2>&1
Compile failed (status 256) errors were:
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.1.20110627 for x86_64-unknown-linux):
	getPredTyDescription EqPred

=====> T4338(profasm) 1850 of 2819 [1, 11, 0]
cd ./indexed-types/should_compile && '/64playpen/simonmar/nightly/HEAD-cam-04-unx/x86_64-unknown-linux/inplace/bin/ghc-stage2' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts  -c T4338.hs -O -prof -auto-all -fasm   >T4338.comp.stderr 2>&1
Compile failed (status 256) errors were:
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.1.20110627 for x86_64-unknown-linux):
	getPredTyDescription EqPred

=====> T2102(profasm) 1852 of 2819 [1, 12, 0]
cd ./indexed-types/should_compile && '/64playpen/simonmar/nightly/HEAD-cam-04-unx/x86_64-unknown-linux/inplace/bin/ghc-stage2' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts  -c T2102.hs -O -prof -auto-all -fasm   >T2102.comp.stderr 2>&1
Compile failed (status 256) errors were:
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.1.20110627 for x86_64-unknown-linux):
	getPredTyDescription EqPred

Trac metadata

Trac field	Value
Version	7.0.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Compiler
Test case
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