PPC: Enable unaligned access and clean up the use of UNALIGNED_ACCESSES

src/ppc/assembler-ppc.cc

Index: src/ppc/assembler-ppc.cc
diff --git a/src/ppc/assembler-ppc.cc b/src/ppc/assembler-ppc.cc
index 79eb01ca8f8c98834118a3a64d98736c3905b553..08a8005ee1a27db09eede1ea44cd8b452c593635 100644
--- a/src/ppc/assembler-ppc.cc
+++ b/src/ppc/assembler-ppc.cc
@@ -1231,6 +1231,21 @@ void Assembler::lwax(Register rt, const MemOperand& src) {
 }
 
 
+void Assembler::ldbrx(Register dst, const MemOperand& src) {
+  x_form(EXT2 | LDBRX, src.ra(), dst, src.rb(), LeaveRC);
+}
+
+
+void Assembler::lwbrx(Register dst, const MemOperand& src) {
+  x_form(EXT2 | LWBRX, src.ra(), dst, src.rb(), LeaveRC);
+}
+
+
+void Assembler::lhbrx(Register dst, const MemOperand& src) {
+  x_form(EXT2 | LHBRX, src.ra(), dst, src.rb(), LeaveRC);
+}
+
+
 void Assembler::stb(Register dst, const MemOperand& src) {
   DCHECK(!src.ra_.is(r0));
   d_form(STB, dst, src.ra(), src.offset(), true);