[cmake] Apply static archive touch logic from D62172 to libraries not using llvm_add_library.

[hintonda]

Summary

These libraries don't invoke llvm_add_library, so apply touch fix
from D62172 directly.

As noted in D62172, this is due to an old version of libtool on Mac
that doesn't support high-resolution timers, which the latest
version of ninja does. Therefore, static libs almost always end up
with an older timestamp than the last object added or updated,
forcing ninja to update the archive and everything that depends on
it.

[hintonda]

There are several more of these, so I've come up with a better solution and will submit a patch to D62172 that moves this logic into llvm_update_compile_flags instead.

llvm/tools/llvm-cfi-verify/lib/CMakeLists.txt

 add_library(LLVMCFIVerify
   STATIC
   FileAnalysis.cpp
   FileAnalysis.h
   GraphBuilder.cpp
   GraphBuilder.h
   )
 
+if(LLVM_TOUCH_STATIC_LIBRARIES)
+  add_custom_command(TARGET LLVMCFIVerify
+    POST_BUILD
+    COMMAND touch ${LLVM_LIBRARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMCFIVerify${CMAKE_STATIC_LIBRARY_SUFFIX}
+    )
+endif()
+
 llvm_update_compile_flags(LLVMCFIVerify)
 llvm_map_components_to_libnames(libs
   DebugInfoDWARF
   MC
   MCParser
   Object
   Support
   Symbolize
   )
 target_link_libraries(LLVMCFIVerify ${libs})
 set_target_properties(LLVMCFIVerify PROPERTIES FOLDER "Libraries")

llvm/tools/llvm-exegesis/lib/CMakeLists.txt

add_library(LLVMExegesis
   RegisterAliasing.cpp
   RegisterValue.cpp
   SchedClassResolution.cpp
   SnippetGenerator.cpp
   Target.cpp
   Uops.cpp
   )
 
+if(LLVM_TOUCH_STATIC_LIBRARIES)
+  add_custom_command(TARGET LLVMExegesis
+    POST_BUILD
+    COMMAND touch ${LLVM_LIBRARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMExegesis${CMAKE_STATIC_LIBRARY_SUFFIX}
+    )
+endif()
+
 llvm_update_compile_flags(LLVMExegesis)
 llvm_map_components_to_libnames(libs
   Analysis
   CodeGen
   Core
   ExecutionEngine
   GlobalISel
   MC

llvm/tools/llvm-exegesis/lib/X86/CMakeLists.txt

 include_directories(
   ${LLVM_MAIN_SRC_DIR}/lib/Target/X86
   ${LLVM_BINARY_DIR}/lib/Target/X86
   )
 
 add_library(LLVMExegesisX86
   STATIC
   Target.cpp
   )
 
+if(LLVM_TOUCH_STATIC_LIBRARIES)
+  add_custom_command(TARGET LLVMExegesisX86
+    POST_BUILD
+    COMMAND touch ${LLVM_LIBRARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMExegesisX86${CMAKE_STATIC_LIBRARY_SUFFIX}
+    )
+endif()
+
 llvm_update_compile_flags(LLVMExegesisX86)
 llvm_map_components_to_libnames(libs
   X86
   Exegesis
   )
 
 target_link_libraries(LLVMExegesisX86 ${libs})
 set_target_properties(LLVMExegesisX86 PROPERTIES FOLDER "Libraries")