Fix the signature of the IndexOf entry point.

The IndexOf entry point was declared as taking four
arguments (void*, uint32_t, uint32_t, uint32_t) whereas all
actual implementations use three arguments (void*, uint32_t,
uint32_t).  As that fourth argument is not documented, drop
it from the intrinsic declaration to have it match the
implementations.

Change-Id: I65d747033192025ccd2b9a5e8f8ed05b77a21941
diff --git a/compiler/optimizing/intrinsics_mips64.cc b/compiler/optimizing/intrinsics_mips64.cc
index ca2652b..0f98549 100644
--- a/compiler/optimizing/intrinsics_mips64.cc
+++ b/compiler/optimizing/intrinsics_mips64.cc
@@ -1636,6 +1636,7 @@
                     TMP,
                     TR,
                     QUICK_ENTRYPOINT_OFFSET(kMips64DoublewordSize, pIndexOf).Int32Value());
+  CheckEntrypointTypes<kQuickIndexOf, int32_t, void*, uint32_t, uint32_t>();
   __ Jalr(TMP);
   __ Nop();