Rename subdir 'Target' variable to 'Implementation' to be less overloaded.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@93718 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/make/lib_util.mk b/make/lib_util.mk
index 768558b..0ff6626 100644
--- a/make/lib_util.mk
+++ b/make/lib_util.mk
@@ -19,20 +19,20 @@
 # defined with a certain specificity.
 SelectFunctionDirs_Opt_ConfigAndArch = $(strip \
   $(foreach key,$(AvailableIn.$(3)),\
-    $(if $(and $(call streq,Optimized,$($(key).Target)),\
+    $(if $(and $(call streq,Optimized,$($(key).Implementation)),\
                $(call contains,$($(key).OnlyConfigs),$(1)),\
                $(call contains,$($(key).OnlyArchs),$(2))),$(key),)))
 SelectFunctionDirs_Opt_Config = $(strip \
   $(foreach key,$(AvailableIn.$(3)),\
-    $(if $(and $(call streq,Optimized,$($(key).Target)),\
+    $(if $(and $(call streq,Optimized,$($(key).Implementation)),\
                $(call contains,$($(key).OnlyConfigs),$(1))),$(key),)))
 SelectFunctionDirs_Opt_Arch = $(strip \
   $(foreach key,$(AvailableIn.$(3)),\
-    $(if $(and $(call streq,Optimized,$($(key).Target)),\
+    $(if $(and $(call streq,Optimized,$($(key).Implementation)),\
                $(call contains,$($(key).OnlyArchs),$(2))),$(key),)))
 SelectFunctionDirs_Gen = $(strip \
   $(foreach key,$(AvailableIn.$(3)),\
-    $(if $(call streq,Generic,$($(key).Target)),$(key))))
+    $(if $(call streq,Generic,$($(key).Implementation)),$(key))))
 
 # Helper function to select the right set of dirs in generic priority order.
 SelectFunctions_Gen = \