Use uint16_t to store instruction implicit uses and defs. Reduces static data.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152301 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp
index c27a485..e09b7f8 100644
--- a/lib/CodeGen/RegAllocFast.cpp
+++ b/lib/CodeGen/RegAllocFast.cpp
@@ -1139,7 +1139,7 @@
   // Add the clobber lists for all the instructions we skipped earlier.
   for (SmallPtrSet<const MCInstrDesc*, 4>::const_iterator
        I = SkippedInstrs.begin(), E = SkippedInstrs.end(); I != E; ++I)
-    if (const unsigned *Defs = (*I)->getImplicitDefs())
+    if (const uint16_t *Defs = (*I)->getImplicitDefs())
       while (*Defs)
         MRI->setPhysRegUsed(*Defs++);