chore: import upstream snapshot with attribution

cmake/Modules/FindLLVMAr.cmake

@@ -0,0 +1,16 @@
+include(FeatureSummary)
+
+find_program(LLVMAR_EXECUTABLE
+  NAMES llvm-ar
+  DOC "The llvm-ar executable"
+  )
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(LLVMAr
+  DEFAULT_MSG
+  LLVMAR_EXECUTABLE)
+
+SET_PACKAGE_PROPERTIES(LLVMAr PROPERTIES
+  URL https://llvm.org/docs/CommandGuide/llvm-ar.html
+  DESCRIPTION "create, modify, and extract from archives"
+)

cmake/Modules/FindLLVMNm.cmake

@@ -0,0 +1,16 @@
+include(FeatureSummary)
+
+find_program(LLVMNM_EXECUTABLE
+  NAMES llvm-nm
+  DOC "The llvm-nm executable"
+  )
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(LLVMNm
+  DEFAULT_MSG
+  LLVMNM_EXECUTABLE)
+
+SET_PACKAGE_PROPERTIES(LLVMNm PROPERTIES
+  URL https://llvm.org/docs/CommandGuide/llvm-nm.html
+  DESCRIPTION "list LLVM bitcode and object file’s symbol table"
+)

cmake/Modules/FindLLVMRanLib.cmake

@@ -0,0 +1,15 @@
+include(FeatureSummary)
+
+find_program(LLVMRANLIB_EXECUTABLE
+  NAMES llvm-ranlib
+  DOC "The llvm-ranlib executable"
+  )
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(LLVMRanLib
+  DEFAULT_MSG
+  LLVMRANLIB_EXECUTABLE)
+
+SET_PACKAGE_PROPERTIES(LLVMRanLib PROPERTIES
+  DESCRIPTION "generate index for LLVM archive"
+)

cmake/Modules/FindPFM.cmake

@@ -0,0 +1,28 @@
+# If successful, the following variables will be defined:
+# PFM_FOUND.
+# PFM_LIBRARIES
+# PFM_INCLUDE_DIRS
+# the following target will be defined:
+# PFM::libpfm
+
+include(FeatureSummary)
+include(FindPackageHandleStandardArgs)
+
+set_package_properties(PFM PROPERTIES
+                       URL http://perfmon2.sourceforge.net/
+                       DESCRIPTION "A helper library to develop monitoring tools"
+                       PURPOSE "Used to program specific performance monitoring events")
+
+find_library(PFM_LIBRARY NAMES pfm)
+find_path(PFM_INCLUDE_DIR NAMES perfmon/pfmlib.h)
+
+find_package_handle_standard_args(PFM REQUIRED_VARS PFM_LIBRARY PFM_INCLUDE_DIR)
+
+if (PFM_FOUND AND NOT TARGET PFM::libpfm)
+    add_library(PFM::libpfm UNKNOWN IMPORTED)
+    set_target_properties(PFM::libpfm PROPERTIES
+        IMPORTED_LOCATION "${PFM_LIBRARY}"
+        INTERFACE_INCLUDE_DIRECTORIES "${PFM_INCLUDE_DIR}")
+endif()
+
+mark_as_advanced(PFM_LIBRARY PFM_INCLUDE_DIR)