Move builder.go over to llvm-objcopy.

Bug: http://b/147452927
Test: treehugger
Change-Id: I60440e44669d226ca2ef2bcd8d0dbba59f01d43f
diff --git a/cc/builder.go b/cc/builder.go
index da8501c..ad7e1e6 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -968,7 +968,7 @@
 func transformBinaryPrefixSymbols(ctx android.ModuleContext, prefix string, inputFile android.Path,
 	flags builderFlags, outputFile android.WritablePath) {
 
-	objcopyCmd := gccCmd(flags.toolchain, "objcopy")
+	objcopyCmd := "${config.ClangBin}/llvm-objcopy"
 
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        prefixSymbols,