Use llvm-{objcopy,strip} when clang lld is used.

* Pass LLVM_{OBJCOPY,STRIP} to makefile rules.
* strip.sh is used only in soong-only mode.
  It will use llvm-strip and  and llvm-objcopy
  when --use-llvm-strip is given.
  Keep flags of strip.sh in alphabetic order.
* Tested build/soong/scripts/build-ndk-prebuilts.sh
  by adding "UseClangLld": true, to soong.variables file.

Bug: 80093681
Test: build/soong/scripts/build-ndk-prebuilts.sh
Change-Id: I612267304eea434c7a33cc086b27b577d5f64094

cc/builder.go

@@ -117,7 +117,7 @@ var (
 		blueprint.RuleParams{
 			Depfile:     "${out}.d",
 			Deps:        blueprint.DepsGCC,
-			Command:     "CROSS_COMPILE=$crossCompile XZ=$xzCmd $stripPath ${args} -i ${in} -o ${out} -d ${out}.d",
+			Command:     "CROSS_COMPILE=$crossCompile XZ=$xzCmd CLANG_BIN=${config.ClangBin} $stripPath ${args} -i ${in} -o ${out} -d ${out}.d",
 			CommandDeps: []string{"$stripPath", "$xzCmd"},
 		},
 		"args", "crossCompile")
@@ -266,6 +266,7 @@ type builderFlags struct {
 	stripKeepSymbols       bool
 	stripKeepMiniDebugInfo bool
 	stripAddGnuDebuglink   bool
+	stripUseLlvmStrip      bool
 }
 
 type Objects struct {
@@ -822,6 +823,9 @@ func TransformStrip(ctx android.ModuleContext, inputFile android.Path,
 	if flags.stripKeepSymbols {
 		args += " --keep-symbols"
 	}
+	if flags.stripUseLlvmStrip {
+		args += " --use-llvm-strip"
+	}
 
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        strip,