[CMake] Respect LLVM instrumentation variables in libraries and executables (#73629)

In #71135 I added this code to `add_pure_swift_host_library`
but failed to realize that it was also needed in
`add_pure_swift_host_tool`. Extract the code into a helper function and
invoke it from both functions in order to be able to instrument the
`swift-plugin-server` and other pure Swift tools.

Author: drodriguez

cmake/modules/AddPureSwift.cmake

@@ -102,6 +102,26 @@ function(_set_pure_swift_link_flags name relpath_to_lib_dir)
   endif()
 endfunction()
 
+function(_set_pure_swift_profile_flags target_name)
+  # This replicates the code existing in LLVM llvm/cmake/modules/HandleLLVMOptions.cmake
+  # The second part of the clause replicates the LINKER_IS_LLD_LINK of the
+  # original.
+  if(LLVM_BUILD_INSTRUMENTED AND NOT (SWIFT_COMPILER_IS_MSVC_LIKE AND SWIFT_USE_LINKER STREQUAL "lld"))
+    string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED)
+    if(LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR")
+      target_link_options(${target_name} PRIVATE
+        "SHELL:-Xclang-linker -fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"")
+    elseif(uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSIR")
+      target_link_options(${target_name} PRIVATE
+        "SHELL:-Xclang-linker -fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"")
+    else()
+      target_link_options(${target_name} PRIVATE
+        "SHELL:-Xclang-linker -fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"")
+    endif()
+  endif()
+endfunction()
+
+
 # Add a new "pure" Swift host library.
 #
 # "Pure" Swift host libraries can only contain Swift code, and will be built
@@ -280,22 +300,7 @@ function(add_pure_swift_host_library name)
     )
   endif()
 
-  # This replicates he code existing in LLVM llvm/cmake/modules/HandleLLVMOptions.cmake
-  # The second part of the clause replicates the LINKER_IS_LLD_LINK of the
-  # original.
-  if(LLVM_BUILD_INSTRUMENTED AND NOT (SWIFT_COMPILER_IS_MSVC_LIKE AND SWIFT_USE_LINKER STREQUAL "lld"))
-    string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED)
-    if(LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR")
-      target_link_options(${name} PRIVATE
-        "SHELL:-Xclang-linker -fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"")
-    elseif(uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSIR")
-      target_link_options(${name} PRIVATE
-        "SHELL:-Xclang-linker -fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"")
-    else()
-      target_link_options(${name} PRIVATE
-        "SHELL:-Xclang-linker -fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"")
-    endif()
-  endif()
+  _set_pure_swift_profile_flags(${name})
 
   # Export this target.
   set_property(GLOBAL APPEND PROPERTY SWIFT_EXPORTS ${name})
@@ -430,4 +435,6 @@ function(add_pure_swift_host_tool name)
   else()
     set_property(GLOBAL APPEND PROPERTY SWIFT_EXPORTS ${name})
   endif()
+
+  _set_pure_swift_profile_flags(${name})
 endfunction()