Add clang_verify property for cc.

This property is to support cflags "-Xclang -verify" build pass in Soong. The behaviors of clang_verify:
- append cflags "-Xclang -verify"
- append "&& touch $out" to the clang command line

Bug: 311284462
Test: go test -run TestClangVerify

Change-Id: Ic5825e2d649da4c3c5ed6da916e9804d7e3c03da
diff --git a/cc/util.go b/cc/util.go
index 3ede8ff..8ffacae 100644
--- a/cc/util.go
+++ b/cc/util.go
@@ -68,6 +68,7 @@
 		needTidyFiles:   in.NeedTidyFiles,
 		sAbiDump:        in.SAbiDump,
 		emitXrefs:       in.EmitXrefs,
+		clangVerify:     in.ClangVerify,
 
 		systemIncludeFlags: strings.Join(in.SystemIncludeFlags, " "),