MIPS: Make the mips port build cleanly with clang.

Port r13583 (b39b116b) and also fix a couple mips-specific warnings.

BUG=

Review URL: https://codereview.chromium.org/13321002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14100 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-mips.h

@@ -291,7 +291,6 @@ class LInstruction: public ZoneObject {
   SetOncePointer<LPointerMap> pointer_map_;
   HValue* hydrogen_value_;
   bool is_call_;
-  bool is_save_doubles_;
 };
 
 

src/mips/macro-assembler-mips.cc

@@ -1928,7 +1928,7 @@ void MacroAssembler::BranchShort(Label* L, Condition cond, Register rs,
                                  BranchDelaySlot bdslot) {
   BRANCH_ARGS_CHECK(cond, rs, rt);
 
-  int32_t offset;
+  int32_t offset = 0;
   Register r2 = no_reg;
   Register scratch = at;
   if (rt.is_reg()) {
@@ -2361,7 +2361,7 @@ void MacroAssembler::BranchAndLinkShort(Label* L, Condition cond, Register rs,
                                         BranchDelaySlot bdslot) {
   BRANCH_ARGS_CHECK(cond, rs, rt);
 
-  int32_t offset;
+  int32_t offset = 0;
   Register r2 = no_reg;
   Register scratch = at;
   if (rt.is_reg()) {
@@ -5514,7 +5514,6 @@ bool AreAliased(Register r1, Register r2, Register r3, Register r4) {
 
 CodePatcher::CodePatcher(byte* address, int instructions)
     : address_(address),
-      instructions_(instructions),
       size_(instructions * Assembler::kInstrSize),
       masm_(NULL, address, size_ + Assembler::kGap) {
   // Create a new macro assembler pointing to the address of the code to patch.

src/mips/macro-assembler-mips.h

@@ -1565,7 +1565,6 @@ class CodePatcher {
 
  private:
   byte* address_;  // The address of the code being patched.
-  int instructions_;  // Number of instructions of the expected patch size.
   int size_;  // Number of bytes of the expected patch size.
   MacroAssembler masm_;  // Macro assembler used to generate the code.
 };

src/mips/simulator-mips.cc

@@ -513,7 +513,7 @@ void MipsDebugger::Debug() {
         int32_t words;
         if (argc == next_arg) {
           words = 10;
-        } else if (argc == next_arg + 1) {
+        } else {
           if (!GetValue(argv[next_arg], &words)) {
             words = 10;
           }