Do away with addLegalFPImmediate. Add a target hook isFPImmLegal which returns true if the fp immediate can be natively codegened by target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85281 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index a2baee4..9f36b67 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -481,7 +481,7 @@
   setOperationAction(ISD::PREFETCH, MVT::Other, Expand);
   
   // ConstantFP nodes default to expand.  Targets can either change this to 
-  // Legal, in which case all fp constants are legal, or use addLegalFPImmediate
+  // Legal, in which case all fp constants are legal, or use isFPImmLegal()
   // to optimize expansions for certain constants.
   setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
   setOperationAction(ISD::ConstantFP, MVT::f64, Expand);