Convert more static tables of registers used by calling convention to uint16_t to reduce space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152538 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 477b5f4..5fe5a76 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -87,7 +87,7 @@
 }
 
 // The APCS parameter registers.
-static const unsigned GPRArgRegs[] = {
+static const uint16_t GPRArgRegs[] = {
   ARM::R0, ARM::R1, ARM::R2, ARM::R3
 };