Port of changes from r3842 (symbol table probing for two character strings) t...

src/arm/codegen-arm.h

Index: src/arm/codegen-arm.h
===================================================================
--- src/arm/codegen-arm.h	(revision 4029)
+++ src/arm/codegen-arm.h	(working copy)
@@ -564,6 +564,36 @@
                                   Register scratch4,
                                   Register scratch5,
                                   int flags);
+
+
+  // Probe the symbol table for a two character string. If the string is
+  // not found by probing a jump to the label not_found is performed. This jump
+  // does not guarantee that the string is not in the symbol table. If the
+  // string is found the code falls through with the string in register r0.
+  // Contents of both c1 and c2 registers are modified. At the exit c1 is
+  // guaranteed to contain halfword with low and high bytes equal to
+  // initial contents of c1 and c2 respectively.
+  void GenerateTwoCharacterSymbolTableProbe(MacroAssembler* masm,
+                                            Register c1,
+                                            Register c2,
+                                            Register scratch1,
+                                            Register scratch2,
+                                            Register scratch3,
+                                            Register scratch4,
+                                            Register scratch5,
+                                            Label* not_found);
+
+  // Generate string hash.
+  void GenerateHashInit(MacroAssembler* masm,
+                        Register hash,
+                        Register character);
+
+  void GenerateHashAddCharacter(MacroAssembler* masm,
+                                Register hash,
+                                Register character);
+
+  void GenerateHashGetHash(MacroAssembler* masm,
+                           Register hash);
 };