Move the personality function from LandingPadInst to Function

The personality routine currently lives in the LandingPadInst.

This isn't desirable because:
- All LandingPadInsts in the same function must have the same
  personality routine.  This means that each LandingPadInst beyond the
  first has an operand which produces no additional information.

- There is ongoing work to introduce EH IR constructs other than
  LandingPadInst.  Moving the personality routine off of any one
  particular Instruction and onto the parent function seems a lot better
  than have N different places a personality function can sneak onto an
  exceptional function.

Differential Revision: http://reviews.llvm.org/D10429

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239940 91177308-0d34-0410-b5e6-96231b3b80d8

test/ExecutionEngine/MCJIT/eh.ll

@@ -14,13 +14,13 @@ define void @throwException() {
   unreachable
 }
 
-define i32 @main() {
+define i32 @main() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
 entry:
   invoke void @throwException()
           to label %try.cont unwind label %lpad
 
 lpad:
-  %p = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+  %p = landingpad { i8*, i32 }
           catch i8* bitcast (i8** @_ZTIi to i8*)
   %e = extractvalue { i8*, i32 } %p, 0
   call i8* @__cxa_begin_catch(i8* %e)