[SampleFDO] Make sample profile loader unaware of compact format change.

The patch tries to make sample profile loader independent of profile format
change. It moves compact format related code into FunctionSamples and
SampleProfileReader classes, and sample profile loader only has to interact
with those two classes and will be unaware of profile format changes.

The cleanup also contain some fixes to further remove the difference between
compactbinary format and binary format. After the cleanup using different
formats originated from the same profile will generate the same binaries,
which we verified by compiling two large server benchmarks w/wo thinlto.

Differential Revision: https://reviews.llvm.org/D51643


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341591 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/SampleProfile/Inputs/function_metadata.prof

@@ -1,13 +1,17 @@
-test:10000:0
+test:3200:0
+ 1: 100
  2: 100
- 3: 100
  3: foo:1000
+  1: 800
   3: bar:200
+   2: 190
    4: baz:10
+    2: 10
  4: foo1:1000
   1: 1000
  4: foo2:1000
   1: 1000 foo3:1000
-test_liveness:10000:0
+test_liveness:1000:0
  1: foo:1000
   1: foo_available:1000
+   2: 1000

test/Transforms/SampleProfile/function_metadata.ll

@@ -1,4 +1,5 @@
 ; RUN: opt < %s -passes='thinlto-pre-link<O2>' -pgo-kind=new-pm-pgo-sample-use-pipeline -profile-file=%S/Inputs/function_metadata.prof -S | FileCheck %s
+; RUN: opt < %s -passes='thinlto-pre-link<O2>' -pgo-kind=new-pm-pgo-sample-use-pipeline -profile-file=%S/Inputs/function_metadata.compact.afdo -S | FileCheck %s
 
 ; Tests whether the functions in the inline stack are added to the
 ; function_entry_count metadata.

test/Transforms/SampleProfile/indirect-call.ll

@@ -1,4 +1,5 @@
 ; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/indirect-call.prof -S | FileCheck %s
+; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/indirect-call.compact.afdo -S | FileCheck %s
 
 ; CHECK-LABEL: @test
 define void @test(void ()*) !dbg !3 {