Add MSP430 interrupt calling conv. No functionality change yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90738 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index 1b7c9c6..cad1d3b 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -540,6 +540,7 @@
   KEYWORD(arm_apcscc);
   KEYWORD(arm_aapcscc);
   KEYWORD(arm_aapcs_vfpcc);
+  KEYWORD(msp430_intrcc);
 
   KEYWORD(cc);
   KEYWORD(c);