[PowerPC] Add implementation for -msave-toc-indirect option - clang portion

[syzaara]

Summary

Add clang option -msave-toc-indirect for PowerPC.

[hfinkel]

Please upload diffs with full context.

include/clang/Driver/Options.td

1907

You also need mno_save_toc_indirect here too.

[jtony]

test/Driver/ppc-features.cpp

140

We probably need to add test for mno_save_toc_indirect also once you add it according to Hal's suggestion.

[sfertile]

include/clang/Driver/Options.td

1907

nit: The new option splits the mvsx and mno_vsx pair. I think we should keep the related options together.

include/clang/Driver/Options.td

 def maltivec : Flag<["-"], "maltivec">, Group<m_ppc_Features_Group>;
 def mno_altivec : Flag<["-"], "mno-altivec">, Group<m_ppc_Features_Group>;
 def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
+def msave_toc_indirect : Flag<["-"], "msave-toc-indirect">, Group<m_ppc_Features_Group>;
 def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
 def mpower8_vector : Flag<["-"], "mpower8-vector">,
     Group<m_ppc_Features_Group>;

test/Driver/ppc-features.cpp

 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-vsx -mvsx -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-VSX %s
 // CHECK-VSX: "-target-feature" "+vsx"
 
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -msave-toc-indirect -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-TOC %s
+// CHECK-TOC: "-target-feature" "+save-toc-indirect"
+
 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-htm -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-NOHTM %s
 // CHECK-NOHTM: "-target-feature" "-htm"