MIPS: Remove soft-float support.

src/mips/code-stubs-mips.h

Index: src/mips/code-stubs-mips.h
diff --git a/src/mips/code-stubs-mips.h b/src/mips/code-stubs-mips.h
index 233ec8e9ac810c58b46d76e74b9d1d3d0b17a57e..0ebfe59956e41de6a8bafc68609d466900546ac7 100644
--- a/src/mips/code-stubs-mips.h
+++ b/src/mips/code-stubs-mips.h
@@ -62,9 +62,7 @@ class TranscendentalCacheStub: public PlatformCodeStub {
 class StoreBufferOverflowStub: public PlatformCodeStub {
  public:
   explicit StoreBufferOverflowStub(SaveFPRegsMode save_fp)
-      : save_doubles_(save_fp) {
-    ASSERT(CpuFeatures::IsSafeForSnapshot(FPU) || save_fp == kDontSaveFPRegs);
-  }
+      : save_doubles_(save_fp) {}
 
   void Generate(MacroAssembler* masm);
 
@@ -486,7 +484,6 @@ class RecordWriteStub: public PlatformCodeStub {
     void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) {
       masm->MultiPush((kJSCallerSaved | ra.bit()) & ~scratch1_.bit());
       if (mode == kSaveFPRegs) {
-        CpuFeatureScope scope(masm, FPU);
         masm->MultiPushFPU(kCallerSavedFPU);
       }
     }
@@ -494,7 +491,6 @@ class RecordWriteStub: public PlatformCodeStub {
     inline void RestoreCallerSaveRegisters(MacroAssembler*masm,
                                            SaveFPRegsMode mode) {
       if (mode == kSaveFPRegs) {
-        CpuFeatureScope scope(masm, FPU);
         masm->MultiPopFPU(kCallerSavedFPU);
       }
       masm->MultiPop((kJSCallerSaved | ra.bit()) & ~scratch1_.bit());
@@ -685,27 +681,6 @@ class FloatingPointHelper : public AllStatic {
                                 FPURegister double_scratch1,
                                 Label* not_int32);
 
-  // Generate non FPU code to check if a double can be exactly represented by a
-  // 32-bit integer. This does not check for 0 or -0, which need
-  // to be checked for separately.
-  // Control jumps to not_int32 if the value is not a 32-bit integer, and falls
-  // through otherwise.
-  // src1 and src2 will be cloberred.
-  //
-  // Expected input:
-  // - src1: higher (exponent) part of the double value.
-  // - src2: lower (mantissa) part of the double value.
-  // Output status:
-  // - dst: 32 higher bits of the mantissa. (mantissa[51:20])
-  // - src2: contains 1.
-  // - other registers are clobbered.
-  static void DoubleIs32BitInteger(MacroAssembler* masm,
-                                   Register src1,
-                                   Register src2,
-                                   Register dst,
-                                   Register scratch,
-                                   Label* not_int32);
-
   // Generates code to call a C function to do a double operation using core
   // registers. (Used when FPU is not supported.)
   // This code never falls through, but returns with a heap number containing