Remove hard coded registers in ARM ldrexd and strexd instructions

This patch replaces the hard coded GPR pair [R0, R1] of
Intrinsic:arm_ldrexd and [R2, R3] of Intrinsic:arm_strexd with
even/odd GPRPair reg class.
Similar to the lowering of atomic_64 operation.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168207 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/EDEmitter.cpp b/utils/TableGen/EDEmitter.cpp
index ea25450..428630e 100644
--- a/utils/TableGen/EDEmitter.cpp
+++ b/utils/TableGen/EDEmitter.cpp
@@ -581,6 +581,7 @@
   REG("cc_out");
   REG("s_cc_out");
   REG("tGPR");
+  REG("GPRPairOp");
   REG("DPR");
   REG("DPR_VFP2");
   REG("DPR_8");