Add support for the mips 'x' inline asm modifier.

Patch by Jack Carter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157057 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/Mips/inlineasm-operand-code.ll b/test/CodeGen/Mips/inlineasm-operand-code.ll
index 4568a84..63190fa 100644
--- a/test/CodeGen/Mips/inlineasm-operand-code.ll
+++ b/test/CodeGen/Mips/inlineasm-operand-code.ll
@@ -11,5 +11,11 @@
 ;CHECK:	#NO_APP
   tail call i32 asm sideeffect "addi $0,$1,${2:X}", "=r,r,I"(i32 7, i32 -3) nounwind
 
+; x with -3
+;CHECK:	#APP
+;CHECK:	addi ${{[0-9]+}},${{[0-9]+}},0xfffd
+;CHECK:	#NO_APP
+  tail call i32 asm sideeffect "addi $0,$1,${2:x}", "=r,r,I"(i32 7, i32 -3) nounwind
+
   ret i32 0
 }