[PATCH] [msp430] Only support the 'm' inline assembly memory constraint. NFC.

[Daniel Sanders]

MSP430 doesn't seem to have any additional constraints. Therefore remove
the target hook.

No functional change intended. Depends on D8173.

http://reviews.llvm.org/D8208

Files:
  lib/Target/MSP430/MSP430ISelLowering.h

Index: lib/Target/MSP430/MSP430ISelLowering.h
===================================================================
--- lib/Target/MSP430/MSP430ISelLowering.h
+++ lib/Target/MSP430/MSP430ISelLowering.h
@@ -102,12 +102,6 @@
                                  const std::string &Constraint,
                                  MVT VT) const override;
 
-    unsigned getInlineAsmMemConstraint(
-        const std::string ConstraintCode) const override {
-      // FIXME: Map different constraints differently.
-      return InlineAsm::Constraint_m;
-    }
-
     /// isTruncateFree - Return true if it's free to truncate a value of type
     /// Ty1 to type Ty2. e.g. On msp430 it's free to truncate a i16 value in
     /// register R15W to i8 by referencing its sub-register R15B.

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