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