methodHandleParamTypes needs to refer to valid memory after rbffi_MethodHandle_Init
methodHandleParamTypes needs to refer to valid memory after rbffi_MethodHandle_Init

Fixes #440

ferventcoder/ffi,ffi/ffi,majioa/ffi,yghannam/ffi,ffi/ffi,ffi/ffi,sparkchaser/ffi,ferventcoder/ffi,majioa/ffi,yghannam/ffi,sparkchaser/ffi,ferventcoder/ffi,MikaelSmith/ffi,sparkchaser/ffi,yghannam/ffi,sparkchaser/ffi,MikaelSmith/ffi,MikaelSmith/ffi,MikaelSmith/ffi,yghannam/ffi,majioa/ffi,yghannam/ffi,majioa/ffi,ferventcoder/ffi