Respond to review comments by @gribozavr.

Author: martinboehme

test/Interop/Cxx/function/Inputs/emit-called-function.h

@@ -1,7 +1,11 @@
-inline int bar() {
+inline int notCalled() {
   return 42;
 }
 
-inline int foo() {
-  return bar();
+inline int calledIndirectly() {
+  return 42;
+}
+
+inline int calledDirectly() {
+  return calledIndirectly();
 }

test/Interop/Cxx/function/emit-called-function-ir.swift

@@ -0,0 +1,20 @@
+// Test that Swift emits code for a C++ inline function that is called from
+// another C++ inline function, but not directly from Swift code.
+//
+// We should not, however, emit code for functions that aren't called even
+// indirectly from Swift.
+
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend %s -I %S/Inputs -enable-cxx-interop -emit-ir -o - | %FileCheck %s
+
+import EmitCalledFunction
+
+// Unfortunately, we have to repeat the CHECK-NOT to express that notCalled()
+// should not occur anywhere in the output.
+
+// CHECK-NOT: @_Z9notCalledv
+// CHECK-DAG: define linkonce_odr i32 @_Z14calledDirectlyv() #{{[0-9]+}} comdat {
+// CHECK-NOT: @_Z9notCalledv
+// CHECK-DAG: define linkonce_odr i32 @_Z16calledIndirectlyv() #{{[0-9]+}} comdat {
+// CHECK-NOT: @_Z9notCalledv
+calledDirectly()