Fix quadratic behavior in InlineFunction by fetching the personality function...

Fix quadratic behavior in InlineFunction by fetching the personality function of the callee once and not for every invoke in the caller.

The callee is usually smaller than the caller, too. This reduces the compile
time of ARMDisassembler.cpp by 32% (Release build). It still takes ages to
compile though.

llvm-svn: 145690