[CMake] Add llvm-profgen to LLVM_TEST_DEPENDS

Otherwise `check-llvm-*` may not rebuild llvm-profgen, causing llvm-profgen tests
to fail if llvm-profgen happens to be stale.

Author: MaskRay

llvm/test/CMakeLists.txt

@@ -102,6 +102,7 @@ set(LLVM_TEST_DEPENDS
           llvm-opt-report
           llvm-pdbutil
           llvm-profdata
+          llvm-profgen
           llvm-ranlib
           llvm-rc
           llvm-readobj