Add try-catches everywhere

[Lense]

1 around every basic block

[Lense]

try-catch example:

int
main(void)
{
        try {
                throw 1;
        } catch (...) { }
        return 0;
}

@_ZTIi = external constant i8*

; Function Attrs: norecurse sspstrong uwtable
define i32 @main() #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
  %1 = alloca i32, align 4
  %2 = alloca i8*
  %3 = alloca i32
  store i32 0, i32* %1, align 4
  %4 = call i8* @__cxa_allocate_exception(i64 4) #1
  %5 = bitcast i8* %4 to i32*
  store i32 1, i32* %5, align 16
  %5 = bitcast i8* %4 to i32*
  store i32 1, i32* %5, align 16
  invoke void @__cxa_throw(i8* %4, i8* bitcast (i8** @_ZTIi to i8*), i8* null) #2
          to label %14 unwind label %6

; <label>:6:                                      ; preds = %0
  %7 = landingpad { i8*, i32 }
          catch i8* null
  %8 = extractvalue { i8*, i32 } %7, 0
  store i8* %8, i8** %2, align 8
  %9 = extractvalue { i8*, i32 } %7, 1
  store i32 %9, i32* %3, align 4
  br label %10

; <label>:10:                                     ; preds = %6
  %11 = load i8*, i8** %2, align 8
  %12 = call i8* @__cxa_begin_catch(i8* %11) #1
  call void @__cxa_end_catch()
  br label %13

; <label>:13:                                     ; preds = %10
  ret i32 0

; <label>:14:                                     ; preds = %0
  unreachable
}

declare i8* @__cxa_allocate_exception(i64)

declare void @__cxa_throw(i8*, i8*, i8*)

declare i32 @__gxx_personality_v0(...)

declare i8* @__cxa_begin_catch(i8*)

declare void @__cxa_end_catch()