Move identical code from platform specific assemblers to assembler.cc

src/x87/assembler-x87.h

Index: src/x87/assembler-x87.h
diff --git a/src/x87/assembler-x87.h b/src/x87/assembler-x87.h
index fef6927b80d990b9a65748031963ad9c9f76df9e..6648391cd48eb6d57e640ad8a3c0bf23906d35b6 100644
--- a/src/x87/assembler-x87.h
+++ b/src/x87/assembler-x87.h
@@ -932,9 +932,8 @@ class Assembler : public AssemblerBase {
   void RecordDebugBreakSlot();
 
   // Record a comment relocation entry that can be used by a disassembler.
-  // Use --code-comments to enable, or provide "force = true" flag to always
-  // write a comment.
-  void RecordComment(const char* msg, bool force = false);
+  // Use --code-comments to enable.
+  void RecordComment(const char* msg);
 
   // Record a deoptimization reason that can be used by a log or cpu profiler.
   // Use --trace-deopt to enable.