[Modules] Rework r274270. Let Clang targets depend on intrinsics_gen.

This gets rid of almost LLVM targets unconditionally depending on intrinsic_gen.

Clang's modules still have weird dependencies and hard to remove intrinsics_gen in better way.
Then, it'd be better to give whole clang targets depend on intrinsic_gen.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@308844 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -413,6 +413,13 @@ add_subdirectory(include)
 get_property(CLANG_TABLEGEN_TARGETS GLOBAL PROPERTY CLANG_TABLEGEN_TARGETS)
 list(APPEND LLVM_COMMON_DEPENDS ${CLANG_TABLEGEN_TARGETS})
 
+# Force target to be built as soon as possible. Clang modules builds depend
+# header-wise on it as they ship all headers from the umbrella folders. Building
+# an entire module might include header, which depends on intrinsics_gen.
+if(LLVM_ENABLE_MODULES AND NOT CLANG_BUILT_STANDALONE)
+  list(APPEND LLVM_COMMON_DEPENDS intrinsics_gen)
+endif()
+
 add_subdirectory(lib)
 add_subdirectory(tools)
 add_subdirectory(runtime)