Move SourcePosition into separate header file.

src/mips64/assembler-mips64.h

Index: src/mips64/assembler-mips64.h
diff --git a/src/mips64/assembler-mips64.h b/src/mips64/assembler-mips64.h
index f8d315d835d4f3dea88d02846524059f0a84c7be..131d1512073c9d5e688fef4a0efedb889e46ee5f 100644
--- a/src/mips64/assembler-mips64.h
+++ b/src/mips64/assembler-mips64.h
@@ -1092,7 +1092,7 @@ class Assembler : public AssemblerBase {
 
   // Record a deoptimization reason that can be used by a log or cpu profiler.
   // Use --trace-deopt to enable.
-  void RecordDeoptReason(const int reason, const SourcePosition position);
+  void RecordDeoptReason(const int reason, int raw_position);
 
   static int RelocateInternalReference(RelocInfo::Mode rmode, byte* pc,
                                        intptr_t pc_delta);