[hot-cold-split] Name split functions with ".cold" suffix

Summary:
The current default of appending "_"+entry block label to the new
extracted cold function breaks demangling. Change the deliminator from
"_" to "." to enable demangling. Because the header block label will
be empty for release compile code, use "extracted" after the "." when
the label is empty.

Additionally, add a mechanism for the client to pass in an alternate
suffix applied after the ".", and have the hot cold split pass use
"cold."+Count, where the Count is currently 1 but can be used to
uniquely number multiple cold functions split out from the same function
with D53588.

Reviewers: sebpop, hiraditya

Subscribers: llvm-commits, erik.pilkington

Differential Revision: https://reviews.llvm.org/D53534

llvm-svn: 345178

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/test/Transforms/CodeExtractor/SingleCondition.ll b/llvm/test/Transforms/CodeExtractor/SingleCondition.ll
index 4110cd95b7e..334364484ee 100644
--- a/llvm/test/Transforms/CodeExtractor/SingleCondition.ll
+++ b/llvm/test/Transforms/CodeExtractor/SingleCondition.ll
@@ -16,7 +16,7 @@ define internal i32 @dummyCaller(i1 %cond, i32* align 2 %align.val) {
 entry:
 ; CHECK-LABEL: @dummyCaller
 ; CHECK: br
-; CHECK: call void @inlinedFunc.1_ 
+; CHECK: call void @inlinedFunc.1.
   %val = call i32 @inlinedFunc(i1 %cond, i32* %align.val)
   ret i32 %val
 }