Add support for the 'h' constraint.

Part of rdar://9119939

llvm-svn: 134203
diff --git a/llvm/test/CodeGen/Thumb/inlineasm-thumb.ll b/llvm/test/CodeGen/Thumb/inlineasm-thumb.ll
new file mode 100644
index 0000000..f2683c8
--- /dev/null
+++ b/llvm/test/CodeGen/Thumb/inlineasm-thumb.ll
@@ -0,0 +1,7 @@
+; RUN: llc < %s -march=thumb | FileCheck %s
+define i32 @t1(i32 %x, i32 %y) nounwind {
+entry:
+  ; CHECK: mov r0, r12
+  %0 = tail call i32 asm "mov $0, $1", "=l,h"(i32 %y) nounwind
+  ret i32 %0
+}