Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic.

These functions not longer assert when passed 0, but simply return false instead.

No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123155 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 0b5c582..000fc40 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -988,7 +988,7 @@
     if (!MO.isReg())
       continue;
     unsigned Reg = MO.getReg();
-    if (Reg == 0 || TargetRegisterInfo::isPhysicalRegister(Reg))
+    if (!TargetRegisterInfo::isVirtualRegister(Reg))
       continue;
     if (!vrm.isReMaterialized(Reg))
       continue;
@@ -1022,7 +1022,7 @@
     if (!mop.isReg())
       continue;
     unsigned Reg = mop.getReg();
-    if (Reg == 0 || TargetRegisterInfo::isPhysicalRegister(Reg))
+    if (!TargetRegisterInfo::isVirtualRegister(Reg))
       continue;
     if (Reg != li.reg)
       continue;