Build and keep llvm-cov and llvm-profdata

These might be useful now that the profiling library in compiler-rt
works.

strip-llvm.sh

@@ -51,7 +51,7 @@ for i in bugpoint c-index-test clang-* diagtool dsymutil git-clang-format hmapto
             rm -f $i
         fi
         ;;
-    llvm-ar|llvm-cvtres|llvm-dlltool|llvm-nm|llvm-objdump|llvm-ranlib|llvm-rc|llvm-readobj|llvm-strings|llvm-pdbutil|llvm-objcopy|llvm-strip)
+    llvm-ar|llvm-cvtres|llvm-dlltool|llvm-nm|llvm-objdump|llvm-ranlib|llvm-rc|llvm-readobj|llvm-strings|llvm-pdbutil|llvm-objcopy|llvm-strip|llvm-cov|llvm-profdata)
         ;;
     ld64.lld|wasm-ld)
         if [ -e $i ]; then