Revert "Fix phis for non-sse2 double values"

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index f502b658a7683981ee6079e86a97f099ffa7ad86..860646c2fd60417e2fdfe5640eabe15cb61c0211 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -382,13 +382,9 @@ bool LCodeGen::GenerateBody() {
 
     instr->CompileToNative(this);
 
-    if (!CpuFeatures::IsSupported(SSE2)) {
-      if (instr->IsGoto()) {
-        x87_stack_.LeavingBlock(current_block_, LGoto::cast(instr));
-      } else if (FLAG_debug_code && FLAG_enable_slow_asserts &&
-                 !instr->IsGap() && !instr->IsReturn()) {
+    if (!CpuFeatures::IsSupported(SSE2) &&
+        FLAG_debug_code && FLAG_enable_slow_asserts) {
         __ VerifyX87StackDepth(x87_stack_.depth());
-      }
     }
   }
   EnsureSpaceForLazyDeopt();
@@ -686,21 +682,6 @@ void LCodeGen::X87Stack::FlushIfNecessary(LInstruction* instr, LCodeGen* cgen) {
       __ fstp(0);
       stack_depth_--;
     }
-    __ VerifyX87StackDepth(0);
-  }
-}
-
-
-void LCodeGen::X87Stack::LeavingBlock(int current_block_id, LGoto* goto_instr) {
-  ASSERT(stack_depth_ <= 1);
-  // If ever used for new stubs producing two pairs of doubles joined into two
-  // phis this assert hits. That situation is not handled, since the two stacks
-  // might have st0 and st1 swapped.
-  if (current_block_id + 1 != goto_instr->block_id()) {
-    // If we have a value on the x87 stack on leaving a block, it must be a
-    // phi input. If the next block we compile is not the join block, we have
-    // to discard the stack state.
-    stack_depth_ = 0;
   }
 }
 
@@ -2505,10 +2486,6 @@ void LCodeGen::EmitGoto(int block) {
 }
 
 
-void LCodeGen::DoClobberDoubles(LClobberDoubles* instr) {
-}
-
-
 void LCodeGen::DoGoto(LGoto* instr) {
   EmitGoto(instr->block_id());
 }