Switch most getReservedRegs() clients to the MRI equivalent.

Using the cached bit vector in MRI avoids comstantly allocating and
recomputing the reserved register bit vector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165983 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineVerifier.cpp b/lib/CodeGen/MachineVerifier.cpp
index 181e09e..14bf53e 100644
--- a/lib/CodeGen/MachineVerifier.cpp
+++ b/lib/CodeGen/MachineVerifier.cpp
@@ -427,7 +427,7 @@
 
 void MachineVerifier::visitMachineFunctionBefore() {
   lastIndex = SlotIndex();
-  regsReserved = TRI->getReservedRegs(*MF);
+  regsReserved = MRI->getReservedRegs();
 
   // A sub-register of a reserved register is also reserved
   for (int Reg = regsReserved.find_first(); Reg>=0;