Use LTO_CODEGEN_PIC_MODEL_DYNAMIC for PIE. This requirest a git version of

gold to work. Since the enum value LDPO_PIE has just been added to plugin-api.h,
use a numeric constant for now so that we don't require an unreleased
version of gold to build.

llvm-svn: 158402

tools/gold/gold-plugin.cpp

@@ -153,6 +153,8 @@ ld_plugin_status onload(ld_plugin_tv *tv) {
         switch (tv->tv_u.tv_val) {
           case LDPO_REL:  // .o
           case LDPO_DYN:  // .so
+          // FIXME: Replace 3 with LDPO_PIE once that is in a released binutils.
+          case 3: // position independent executable
             output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC;
             break;
           case LDPO_EXEC:  // .exe