[PATCH] [ELF]: Initial implementation for ARM static linking

[Shankar Kalpathi Easwaran]

Need some more tests 

a) TLS
b) Check the ARM relocations that you have implemented.

You havent fixed up the exidx_start/end symbol.

I dont see the defsym test testing pieces of ARM functionality that you have implemented.

================
Comment at: lib/ReaderWriter/ELF/ARM/ARMRelocationHandler.cpp:101-103
@@ +100,5 @@
+  case R_ARM_THM_JUMP11:
+    return int16_t(
+               *reinterpret_cast<const llvm::support::little16_t *>(location)) &
+           0x7FF;
+  default:
----------------
Can you indent some of these manually.

================
Comment at: lib/ReaderWriter/ELF/ARM/ARMRelocationHandler.cpp:189-192
@@ +188,6 @@
+/// \brief R_ARM_THM_CALL - ((S + A) | T) - P => S + A - P
+static void relocR_ARM_THM_CALL(uint8_t *location, uint64_t P, uint64_t S,
+                                int64_t A, bool useJs) {
+  return relocR_ARM_THM_B_L(location, P, S, A, useJs);
+}
+
----------------
Isnt this suppose to use a veneer/shim to reach if the target is ARM ?

================
Comment at: lib/ReaderWriter/ELF/ARM/ARMRelocationHandler.cpp:416-417
@@ +415,4 @@
+      targetVAddress = _ARMTargetLayout.getGOTSymAddr();
+    } else if (auto segment =
+                   _ARMTargetLayout.findSegmentByAtom(ref.target())) {
+      targetVAddress = segment->virtualAddr();
----------------
I think you should cache this address.

http://reviews.llvm.org/D6446