Update and improve support for ARMv7 bitfield instructions....

test/cctest/test-assembler-arm.cc

Index: test/cctest/test-assembler-arm.cc
===================================================================
--- test/cctest/test-assembler-arm.cc	(revision 4740)
+++ test/cctest/test-assembler-arm.cc	(working copy)
@@ -280,4 +280,37 @@
   }
 }
 
+
+TEST(5) {
+  // Test the ARMv7 bitfield instructions.
+  InitializeVM();
+  v8::HandleScope scope;
+
+  Assembler assm(NULL, 0);
+
+  // On entry, r0 = 0xAAAAAAAA = 0b10..10101010.
+  __ ubfx(r0, r0, 1, 12);  // 0b00..010101010101 = 0x555
+  __ sbfx(r0, r0, 0, 5);   // 0b11..111111110101 = -11
+  __ bfc(r0, 1, 3);        // 0b11..111111110001 = -15
+  __ mov(r1, Operand(7));
+  __ bfi(r0, r1, 3, 3);    // 0b11..111111111001 = -7
+  __ mov(pc, Operand(lr));
+
+  CodeDesc desc;
+  assm.GetCode(&desc);
+  Object* code = Heap::CreateCode(desc,
+                                  NULL,
+                                  Code::ComputeFlags(Code::STUB),
+                                  Handle<Object>(Heap::undefined_value()));
+  CHECK(code->IsCode());
+#ifdef DEBUG
+  Code::cast(code)->Print();
+#endif
+  F1 f = FUNCTION_CAST<F1>(Code::cast(code)->entry());
+  int res = reinterpret_cast<int>(
+              CALL_GENERATED_CODE(f, 0xAAAAAAAA, 0, 0, 0, 0));
+  ::printf("f() = %d\n", res);
+  CHECK_EQ(-7, res);
+}
+
 #undef __