[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/multiple-exits.ll b/llvm/test/Transforms/HotColdSplit/multiple-exits.ll
index 2e7cf84..c41e4f0 100644
--- a/llvm/test/Transforms/HotColdSplit/multiple-exits.ll
+++ b/llvm/test/Transforms/HotColdSplit/multiple-exits.ll
@@ -1,4 +1,4 @@
-; RUN: opt -S -hotcoldsplit < %s | FileCheck %s
+; RUN: opt -S -hotcoldsplit -hotcoldsplit-threshold=0 < %s | FileCheck %s
 
 ; Source:
 ;
@@ -55,7 +55,6 @@
 }
 
 ; CHECK-LABEL: define {{.*}}@foo.cold.1(
-; TODO: Eliminate this unnecessary unconditional branch.
 ; CHECK: br
 ; CHECK: [[exit1Stub:.*]]:
 ; CHECK-NEXT: ret i1 true