[MSP430] Use generic operand printer for modifiers

[INdek]

Summary

Fix Generic CodeGen test CodeGen/Generic/asm-large-immediate.ll by using the
generic operand printer when a modifier is given.

[lebedev.ri]

Is this NFC or is there a test missing?

[INdek]

This test was failing with the MSP430 target: CodeGen/Generic/asm-large-immediate.ll.

Should I create a similar test and place it under the MSP430 tests?

[lebedev.ri]

In D59460#1432174, @INdek wrote:

This test was failing with the MSP430 target: CodeGen/Generic/asm-large-immediate.ll.

Should I create a similar test and place it under the MSP430 tests?

It is probably best to add standalone test for this.
The Generic test will only test this if the default target arch is MSP430.

[INdek]

• Add test for MSP430 asm printing modifiers

[INdek]

ping

llvm/lib/Target/MSP430/MSP430AsmPrinter.cpp

 }
 
 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 ///
 bool MSP430AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                                        unsigned AsmVariant,
                                        const char *ExtraCode, raw_ostream &O) {
   // Does this asm operand have a single letter operand modifier?
-  if (ExtraCode && ExtraCode[0])
-    return true; // Unknown modifier.
+  if (ExtraCode && ExtraCode[0]) {
+    if (ExtraCode[1] != 0) return true; // Unknown modifier.
+
+    switch (ExtraCode[0]) {
+    default:
+      // See if this is a generic print operand
+      return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
+    }
+  }
 
   printOperand(MI, OpNo, O);
   return false;
 }
 
 bool MSP430AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
                                              unsigned OpNo, unsigned AsmVariant,
                                              const char *ExtraCode,