ART: refactor x86/x86-64 entrypoints

This patch:

- removes unused stubs in x86/64 runtimes (art_quick_l2d, art_quick_l2f
  and art_quick_idivmod)
- replaces art_quick_fmod, art_quick_fmodf and art_quick_is_assignable
  entrypoints in x86-64 to the direct calls
- removes art_quick_indexof stub in x86-64

Change-Id: I6141c5c73b0b449fa3b866068b101e0be211b93e
Signed-off-by: Alexei Zavjalov <alexei.zavjalov@intel.com>
diff --git a/runtime/arch/x86/entrypoints_init_x86.cc b/runtime/arch/x86/entrypoints_init_x86.cc
index c4a7b1b..8ad29dd 100644
--- a/runtime/arch/x86/entrypoints_init_x86.cc
+++ b/runtime/arch/x86/entrypoints_init_x86.cc
@@ -71,11 +71,8 @@
 // Math entrypoints.
 extern "C" double art_quick_fmod(double, double);
 extern "C" float art_quick_fmodf(float, float);
-extern "C" double art_quick_l2d(int64_t);
-extern "C" float art_quick_l2f(int64_t);
 extern "C" int64_t art_quick_d2l(double);
 extern "C" int64_t art_quick_f2l(float);
-extern "C" int32_t art_quick_idivmod(int32_t, int32_t);
 extern "C" int64_t art_quick_ldiv(int64_t, int64_t);
 extern "C" int64_t art_quick_lmod(int64_t, int64_t);
 extern "C" int64_t art_quick_lmul(int64_t, int64_t);
@@ -181,12 +178,12 @@
   // points->pCmplFloat = NULL;  // Not needed on x86.
   qpoints->pFmod = art_quick_fmod;
   // qpoints->pSqrt = NULL;  // Not needed on x86.
-  qpoints->pL2d = art_quick_l2d;
+  // qpoints->pL2d = NULL;  // Not needed on x86.
   qpoints->pFmodf = art_quick_fmodf;
-  qpoints->pL2f = art_quick_l2f;
+  // qpoints->pL2f = NULL;  // Not needed on x86.
   // points->pD2iz = NULL;  // Not needed on x86.
   // points->pF2iz = NULL;  // Not needed on x86.
-  qpoints->pIdivmod = art_quick_idivmod;
+  // qpoints->pIdivmod = NULL;  // Not needed on x86.
   qpoints->pD2l = art_quick_d2l;
   qpoints->pF2l = art_quick_f2l;
   qpoints->pLdiv = art_quick_ldiv;