Define clang lld flags for hosts.

* Add -fuse-ld=lld to hostGlobalLldflags.
* Set up *ClangLldflags variables for hosts.
  They are the same as *ClangLdflags, but could be changed in the future.

Bug: 73768157
Test: make checkbuild
Change-Id: I3d61504ab7262d472bbf933df7c1a9bef62519e1
diff --git a/cc/config/global.go b/cc/config/global.go
index 051eba5..d998ca2 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -99,7 +99,7 @@
 
 	hostGlobalLdflags = []string{}
 
-	hostGlobalLldflags = []string{}
+	hostGlobalLldflags = []string{"-fuse-ld=lld"}
 
 	commonGlobalCppflags = []string{
 		"-Wsign-promo",