ARM: Fix epilogue instrumentation to handle MONO_TYPE_{GENERICINST,R4,R8} correctly.
Revert "ARM: Fix epilogue instrumentation to handle MONO_TYPE_{GENERICINST,R4,R8} correctly."

This reverts commit 1afa622ba446ca7f67f24d446b938826bd568574.

I had a more recent version of this commit locally...
ARM: Fix epilogue instrumentation to handle MONO_TYPE_{GENERICINST,R4,R8} correctly.