Index: llvm/CMakeLists.txt
===================================================================
--- llvm/CMakeLists.txt
+++ llvm/CMakeLists.txt
@@ -410,6 +410,8 @@
   "Use Intel JIT API to inform Intel(R) VTune(TM) Amplifier XE 2011 about JIT code"
   OFF)
 
+option(LLVM_ENABLE_PDB "Generate .pdb files for profiling in Release build" OFF)
+
 if( LLVM_USE_INTEL_JITEVENTS )
   # Verify we are on a supported platform
   if( NOT CMAKE_SYSTEM_NAME MATCHES "Windows" AND NOT CMAKE_SYSTEM_NAME MATCHES "Linux" )
@@ -1022,4 +1024,3 @@
 if (MSVC AND CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
   include(InstallRequiredSystemLibraries)
 endif()
-
Index: llvm/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm/cmake/modules/HandleLLVMOptions.cmake
+++ llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -353,6 +353,11 @@
 
   append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
 
+  if (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" AND LLVM_ENABLE_PDB)
+    append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+    append("/DEBUG" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
+  endif (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" AND LLVM_ENABLE_PDB)
+
   # /Zc:strictStrings is incompatible with VS12's (Visual Studio 2013's)
   # debug mode headers. Instead of only enabling them in VS2013's debug mode,
   # we'll just enable them for Visual Studio 2015 (VS 14, MSVC_VERSION 1900)