[HotColdSplit] Simplify tests by lowering their splitting thresholds

This gets rid of the brittle/mysterious calls to @sink()/@sideeffect()
peppered throughout the test cases. They are no longer needed to force
splitting to occur.

llvm-svn: 351480
diff --git a/llvm/test/Transforms/HotColdSplit/split-out-dbg-val-of-arg.ll b/llvm/test/Transforms/HotColdSplit/split-out-dbg-val-of-arg.ll
index becfaf8..54ca195 100644
--- a/llvm/test/Transforms/HotColdSplit/split-out-dbg-val-of-arg.ll
+++ b/llvm/test/Transforms/HotColdSplit/split-out-dbg-val-of-arg.ll
@@ -1,4 +1,4 @@
-; RUN: opt -hotcoldsplit -S < %s | FileCheck %s
+; RUN: opt -hotcoldsplit -hotcoldsplit-threshold=0 -S < %s | FileCheck %s
 
 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-apple-macosx10.14.0"
@@ -17,8 +17,6 @@
 if.end:                                           ; preds = %entry
   call void @llvm.dbg.value(metadata i32 %arg1, metadata !9, metadata !DIExpression()), !dbg !11
   call void @sink()
-  call void @sink()
-  call void @sink()
   ret void
 }