Thumb2 Backend: Update Code objects with mode, separate Assembler methods for Thumb2

src/arm/assembler-thumb.cc

Index: src/arm/assembler-thumb.cc
diff --git a/src/arm/assembler-thumb.cc b/src/arm/assembler-thumb.cc
index 8ddc14b71396c092d4151be9fc3283f012fa56f2..7cf59236889532a52a28faebb74bf7aee2222287 100644
--- a/src/arm/assembler-thumb.cc
+++ b/src/arm/assembler-thumb.cc
@@ -1350,6 +1350,13 @@ void Assembler::ldr_pc_thumb(Register dst, const Operand& src) {
   ldr_thumb(dst, MemOperand(pc, 0));
 }
 
+
+bool Assembler::IsThumbLdrPcImmediateOffset(Instr instr) {
+  // Check the instruction is indeed a
+  // ldr<cond> <Rd>, [pc +/- offset_12].
+  return (instr & kThumbLdrPCMask) == kThumbLdrPCPattern;
+}
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM