Make each target map all inline assembly memory constraints to InlineAsm::Constraint_m. NFC.

Summary:
This is instead of doing this in target independent code and is the last
non-functional change before targets begin to distinguish between
different memory constraints when selecting code for the ISD::INLINEASM
node.

Next, each target will individually move away from the idea that all
memory constraints behave like 'm'.

Subscribers: jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D8173


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232373 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PowerPC/PPCISelLowering.h

@@ -519,6 +519,12 @@ namespace llvm {
                                       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;
+    }
+
     /// isLegalAddressingMode - Return true if the addressing mode represented
     /// by AM is legal for this target, for a load/store of the specified type.
     bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const override;