X87: Made the detailed reason for deopts mandatory on x87. Unified and improved things.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index 322c24a41a93e752df0b0d7abfeaaf89b017d041..a45ebb7f4b0e5c4cec997981f3054c23ecaa9d62 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -435,7 +435,8 @@ class MacroAssembler: public Assembler {
   void TruncateX87TOSToI(Register result_reg);
 
   void X87TOSToI(Register result_reg, MinusZeroMode minus_zero_mode,
-      Label* conversion_failed, Label::Distance dst = Label::kFar);
+      Label* lost_precision, Label* is_nan, Label* minus_zero,
+      Label::Distance dst = Label::kFar);
 
   // Smi tagging support.
   void SmiTag(Register reg) {