Port regexp microoptimizations to MIPS. Also fix some formatting. This...

Port regexp microoptimizations to MIPS.  Also fix some formatting.  This includes http://codereview.chromium.org/9965107/ from Daniel Kalmar

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11281 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/regexp-macro-assembler-mips.cc

@@ -461,7 +461,8 @@ void RegExpMacroAssemblerMIPS::CheckCharacterAfterAnd(uint32_t c,
                                                       uint32_t mask,
                                                       Label* on_equal) {
   __ And(a0, current_character(), Operand(mask));
-  BranchOrBacktrack(on_equal, eq, a0, Operand(c));
+  Operand rhs = (c == 0) ? Operand(zero_reg) : Operand(c);
+  BranchOrBacktrack(on_equal, eq, a0, rhs);
 }
 
 
@@ -469,7 +470,8 @@ void RegExpMacroAssemblerMIPS::CheckNotCharacterAfterAnd(uint32_t c,
                                                          uint32_t mask,
                                                          Label* on_not_equal) {
   __ And(a0, current_character(), Operand(mask));
-  BranchOrBacktrack(on_not_equal, ne, a0, Operand(c));
+  Operand rhs = (c == 0) ? Operand(zero_reg) : Operand(c);
+  BranchOrBacktrack(on_not_equal, ne, a0, rhs);
 }
 
 
@@ -1198,7 +1200,9 @@ void RegExpMacroAssemblerMIPS::BranchOrBacktrack(Label* to,
 }
 
 
-void RegExpMacroAssemblerMIPS::SafeCall(Label* to, Condition cond, Register rs,
+void RegExpMacroAssemblerMIPS::SafeCall(Label* to,
+                                        Condition cond,
+                                        Register rs,
                                         const Operand& rt) {
   __ BranchAndLink(to, cond, rs, rt);
 }