Faster 64-bit left-shift for ia32.

runtime/vm/assembler_ia32.cc

Index: runtime/vm/assembler_ia32.cc
===================================================================
--- runtime/vm/assembler_ia32.cc	(revision 13352)
+++ runtime/vm/assembler_ia32.cc	(working copy)
@@ -1224,6 +1224,11 @@
 }
 
 
+void Assembler::shll(const Address& operand, Register shifter) {
+  EmitGenericShift(4, Operand(operand), shifter);
+}
+
+
 void Assembler::shrl(Register reg, const Immediate& imm) {
   EmitGenericShift(5, reg, imm);
 }
@@ -1257,6 +1262,13 @@
 }
 
 
+void Assembler::shld(const Address& operand, Register src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0xA5);
+  EmitOperand(src, Operand(operand));
+}
+
 void Assembler::shrd(Register dst, Register src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x0F);