[Flang] Assign unittests to flang_compile pool (llvm#150041)

llvm#127364 added the FLANG_PARALLEL_COMPILE_JOBS option to limit the number
of parallel compilations of Flang sources which require an unusal amount
of memory. This patch also adds Flang's unittests to this pool that use
about the same amount of memory due to including the same headers.

Author: Meinersbur

flang/unittests/CMakeLists.txt

@@ -12,6 +12,9 @@ set_target_properties(FlangUnitTests PROPERTIES FOLDER "Flang/Tests")
 
 function(add_flang_unittest test_dirname)
   add_unittest(FlangUnitTests ${test_dirname} ${ARGN})
+  if (FLANG_PARALLEL_COMPILE_JOBS)
+    set_property(TARGET ${test_dirname} PROPERTY JOB_POOL_COMPILE flang_compile_job_pool)
+  endif ()
 endfunction()
 
 if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG)
@@ -35,6 +38,9 @@ function(add_flang_nongtest_unittest test_name)
 
   add_executable(${test_name}${suffix} "${test_filepath}")
   set_target_properties(${test_name}${suffix} PROPERTIES FOLDER "Flang/Tests/Unit")
+  if (FLANG_PARALLEL_COMPILE_JOBS)
+    set_property(TARGET ${test_name}${suffix} PROPERTY JOB_POOL_COMPILE flang_compile_job_pool)
+  endif ()
 
   if (LLVM_LINK_LLVM_DYLIB AND NOT ARG_DISABLE_LLVM_LINK_LLVM_DYLIB)
     set(llvm_libs LLVM)