[PATCH] [nvptx] Only support the 'm' inline assembly memory constraint. NFC.

[Daniel Sanders]

Hi jholewinski,

NVPTX doesn't seem to support any additional constraints. Therefore remove
the target hook.

No functional change intended. Depends on D8173.

http://reviews.llvm.org/D8209

Files:
  lib/Target/NVPTX/NVPTXISelLowering.h

Index: lib/Target/NVPTX/NVPTXISelLowering.h
===================================================================
--- lib/Target/NVPTX/NVPTXISelLowering.h
+++ lib/Target/NVPTX/NVPTXISelLowering.h
@@ -497,12 +497,6 @@
                                     std::vector<SDValue> &Ops,
                                     SelectionDAG &DAG) const override;
 
-  unsigned getInlineAsmMemConstraint(
-      const std::string ConstraintCode) const override {
-    // FIXME: Map different constraints differently.
-    return InlineAsm::Constraint_m;
-  }
-
   const NVPTXTargetMachine *nvTM;
 
   // PTX always uses 32-bit shift amounts

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