[codeview] Only emit function ids for inlined functions

We aren't referencing any other kind of function currently.
Should save a bit on our debug info size.

llvm-svn: 263817
diff --git a/llvm/test/DebugInfo/COFF/inlining-files.ll b/llvm/test/DebugInfo/COFF/inlining-files.ll
index 6a4cff8..261f0b6 100644
--- a/llvm/test/DebugInfo/COFF/inlining-files.ll
+++ b/llvm/test/DebugInfo/COFF/inlining-files.ll
@@ -24,7 +24,7 @@
 ; OBJ:    InlineSite {
 ; OBJ:      PtrParent: 0x0
 ; OBJ:      PtrEnd: 0x0
-; OBJ:      Inlinee: file_change (0x1003)
+; OBJ:      Inlinee: file_change (0x1002)
 ; OBJ:      BinaryAnnotations [
 ; OBJ:        ChangeCodeOffsetAndLineOffset: {CodeOffset: 0x6, LineOffset: 1}
 ; OBJ:        ChangeFile: D:\src\llvm\build\t.inc (0x8)