CMake: Add option to set LLVM_ENABLE_DUMP

[MatzeB]

With phabricator mails back, I just realized that I accidentally committed this yesterday before reviews working, sorry.

llvm/trunk/CMakeLists.txt

 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
   option(LLVM_ENABLE_ASSERTIONS "Enable assertions" OFF)
 else()
   option(LLVM_ENABLE_ASSERTIONS "Enable assertions" ON)
 endif()
 
 option(LLVM_ENABLE_EXPENSIVE_CHECKS "Enable expensive checks" OFF)
 
+option(LLVM_ENABLE_DUMP "Enable dump functions in release builds" OFF)
+
 set(LLVM_ABI_BREAKING_CHECKS "WITH_ASSERTS" CACHE STRING
   "Enable abi-breaking checks.  Can be WITH_ASSERTS, FORCE_ON or FORCE_OFF.")
 
 option(LLVM_FORCE_USE_OLD_HOST_TOOLCHAIN
        "Set to ON to force using an old, unsupported host toolchain." OFF)
 
 option(LLVM_USE_INTEL_JITEVENTS
   "Use Intel JIT API to inform Intel(R) VTune(TM) Amplifier XE 2011 about JIT code"

llvm/trunk/cmake/modules/HandleLLVMOptions.cmake

if( LLVM_ENABLE_ASSERTIONS )
   endif()
 endif()
 
 if(LLVM_ENABLE_EXPENSIVE_CHECKS)
   add_definitions(-DEXPENSIVE_CHECKS)
   add_definitions(-D_GLIBCXX_DEBUG)
 endif()
 
+if(LLVM_ENABLE_DUMP)
+  add_definitions(-DLLVM_ENABLE_DUMP)
+endif()
+
 string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS)
 
 if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" )
   if( LLVM_ENABLE_ASSERTIONS )
     set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
   endif()
 elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" )
   set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )