Fix part 1 of pr4682. PICADD is a 16-bit instruction even in thumb2 mode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78126 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index 9917e01..cc4f20c 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -127,10 +127,11 @@
            [(ARMcallseq_start imm:$amt)]>, Requires<[IsThumb1Only]>;
 }
 
+// For both thumb1 and thumb2.
 let isNotDuplicable = 1 in
-def tPICADD : T1It<(outs tGPR:$dst), (ins tGPR:$lhs, pclabel:$cp),
-                  "$cp:\n\tadd $dst, pc",
-                  [(set tGPR:$dst, (ARMpic_add tGPR:$lhs, imm:$cp))]>;
+def tPICADD : TIt<(outs GPR:$dst), (ins GPR:$lhs, pclabel:$cp),
+                 "$cp:\n\tadd $dst, pc",
+                 [(set GPR:$dst, (ARMpic_add GPR:$lhs, imm:$cp))]>;
 
 // PC relative add.
 def tADDrPCi : T1I<(outs tGPR:$dst), (ins i32imm:$rhs),