Revert r344630 Disable code object version 3 for HIP toolchain.

Remove the workaround so that by default code object v3 is enabled.

llvm-svn: 363076
diff --git a/clang/lib/Driver/ToolChains/HIP.cpp b/clang/lib/Driver/ToolChains/HIP.cpp
index 0f8be07..0afd062 100644
--- a/clang/lib/Driver/ToolChains/HIP.cpp
+++ b/clang/lib/Driver/ToolChains/HIP.cpp
@@ -127,7 +127,7 @@
     llvm::StringRef OutputFilePrefix, const char *InputFileName) const {
   // Construct llc command.
   ArgStringList LlcArgs{InputFileName, "-mtriple=amdgcn-amd-amdhsa",
-                        "-filetype=obj", "-mattr=-code-object-v3",
+                        "-filetype=obj",
                         Args.MakeArgString("-mcpu=" + SubArchName)};
 
   // Extract all the -m options