make printInstruction return void since its result is omitted.  Make the 
error condition get trapped with an assert.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78449 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp b/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp
index 92b85d3..a4690a9 100644
--- a/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp
+++ b/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp
@@ -46,7 +46,7 @@
     virtual const char *getPassName() const {
       return "Alpha Assembly Printer";
     }
-    bool printInstruction(const MachineInstr *MI);
+    void printInstruction(const MachineInstr *MI);
     void printOp(const MachineOperand &MO, bool IsCallOp = false);
     void printOperand(const MachineInstr *MI, int opNum);
     void printBaseOffsetPair(const MachineInstr *MI, int i, bool brackets=true);