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/CodeGen/X86/code_placement_eh.ll

@@ -6,7 +6,7 @@
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
 target triple = "i386-apple-darwin10.0"
 
-define void @foo() {
+define void @foo() personality i32 (...)* @__gxx_personality_v0 {
 invcont5:
   br label %bb15
 
@@ -22,12 +22,12 @@ bb18.i5.i:                                        ; preds = %.noexc6.i.i, %bb51.
           to label %.noexc6.i.i unwind label %lpad.i.i ; <float> [#uses=0]
 
 lpad.i.i:                                         ; preds = %bb18.i5.i, %.noexc6.i.i
-  %lpadval.i.i = landingpad { i8*, i32 } personality i32 (...)* @__gxx_personality_v0
+  %lpadval.i.i = landingpad { i8*, i32 }
           catch i8* null
   unreachable
 
 lpad59.i:                                         ; preds = %bb15
-  %lpadval60.i.i = landingpad { i8*, i32 } personality i32 (...)* @__gxx_personality_v0
+  %lpadval60.i.i = landingpad { i8*, i32 }
           catch i8* null
   unreachable