Add support for int-to-char in the optimizing compiler.

- Add support for the int-to-char Dex instruction in the
  optimizing compiler.
- Implement the ARM and Thumb-2 UBFX instructions and add
  tests for them.
- Generate x86, x86-64 and ARM (but not ARM64) code for
  byte to char, short to char, int to char (and char to
  char!) HTypeConversion nodes.
- Add related tests to test/422-type-conversion.

Change-Id: I5cd4c6d86f0f6a966c059715b98db35cc8f9de76
diff --git a/compiler/optimizing/builder.cc b/compiler/optimizing/builder.cc
index df3d57e..b51b6e7 100644
--- a/compiler/optimizing/builder.cc
+++ b/compiler/optimizing/builder.cc
@@ -1007,6 +1007,11 @@
       break;
     }
 
+    case Instruction::INT_TO_CHAR: {
+      Conversion_12x(instruction, Primitive::kPrimInt, Primitive::kPrimChar);
+      break;
+    }
+
     case Instruction::ADD_INT: {
       Binop_23x<HAdd>(instruction, Primitive::kPrimInt);
       break;