New tag for ittapi - fix an error related to cross-compiling ITTAPI in LLVM with mingw

[ekovanov]

Summary

Fix was implemented in the ittap repo to solve an error about cross-compiling ITTAPI in LLVM with mingw.
The problem occurred in the cross-compilation environment for Julia's dependencies.
The corresponding issue item in ittapi repo: https://github.com/intel/ittapi/issues/19
A new tag was created in ittapi repo for that fix.

This patch contains changes to update the ittapi tag in LLVM.

[ekovanov]

@bader could you please land this? Unfortunately, I do not have commit access to land this one.

llvm/lib/ExecutionEngine/IntelJITEvents/CMakeLists.txt

 include_directories( ${CMAKE_CURRENT_SOURCE_DIR}/.. )
 
 if(NOT DEFINED ITTAPI_GIT_REPOSITORY)
     set(ITTAPI_GIT_REPOSITORY https://github.com/intel/ittapi.git)
 endif()
 
 if(NOT DEFINED ITTAPI_GIT_TAG)
-    set(ITTAPI_GIT_TAG v3.18.10)
+    set(ITTAPI_GIT_TAG v3.18.12)
 endif()
 
 if(NOT DEFINED ITTAPI_SOURCE_DIR)
     set(ITTAPI_SOURCE_DIR ${PROJECT_BINARY_DIR})
 endif()
 
 if(NOT EXISTS ${ITTAPI_SOURCE_DIR}/ittapi)
     execute_process(COMMAND ${GIT_EXECUTABLE} clone ${ITTAPI_GIT_REPOSITORY}