[MachineIRBuilder] Add buildOr helper. NFC.

This isn't used anywhere yet, but I need it for a future commit.

llvm-svn: 307141
diff --git a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
index c0066f6..9dcc631 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -240,6 +240,10 @@
   return buildBinaryOp(TargetOpcode::G_AND, Res, Op0, Op1);
 }
 
+MachineInstrBuilder MachineIRBuilder::buildOr(unsigned Res, unsigned Op0,
+                                               unsigned Op1) {
+  return buildBinaryOp(TargetOpcode::G_OR, Res, Op0, Op1);
+}
 
 MachineInstrBuilder MachineIRBuilder::buildBr(MachineBasicBlock &Dest) {
   return buildInstr(TargetOpcode::G_BR).addMBB(&Dest);