AArch64: add 'a' inline asm operand modifier

This is used in the Linux kernel, and effectively just means "print an
address".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193593 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/AArch64/AArch64AsmPrinter.cpp b/lib/Target/AArch64/AArch64AsmPrinter.cpp
index 759809f..911218a 100644
--- a/lib/Target/AArch64/AArch64AsmPrinter.cpp
+++ b/lib/Target/AArch64/AArch64AsmPrinter.cpp
@@ -230,6 +230,8 @@
     // Output bits 23:12 of symbolic address with appropriate :hi12: relocation
     // modifier (currently only for TLS local exec).
     return printSymbolicAddress(MI->getOperand(OpNum), true, "hi12", O);
+  case 'a':
+    return PrintAsmMemoryOperand(MI, OpNum, AsmVariant, ExtraCode, O);
   }