[arm] Use single instruction tail call sequence.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 5f6076b41dfbd1bf726930aa129b4b63a1b51361..76c63e723179ab689e52a0c9c3e80e1b9962cc01 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -59,8 +59,9 @@ void MacroAssembler::Jump(Register target, Condition cond) {
 
 void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode,
                           Condition cond) {
-  mov(ip, Operand(target, rmode));
-  bx(ip, cond);
+  // 'target' is always generated ARM code, never THUMB code.

[ulan, 2013/12/12 09:42:16]

Maybe assert that rmode is not external reference.

[Rodolph Perfetta, 2013/12/12 09:50:30]

on armv5t and above this will interwork properly, no need to assert.

[Benedikt Meurer, 2013/12/12 12:23:51]

Done.

[Benedikt Meurer, 2013/12/12 12:23:51]

Done.

+  ASSERT_EQ(0, target & 0x3);
+  mov(pc, Operand(target, rmode), LeaveCC, cond);
 }