X87: initialize the FPU state for X87 in prologue.

   This CL is a fix for c0c3d866 (r30606).
   In r30606, initialization of FPU implementation is not moved to prologue
   generation correctly.

BUG=

Review URL: https://codereview.chromium.org/1317643009

Cr-Commit-Position: refs/heads/master@{#30626}

src/x87/lithium-codegen-x87.cc

@@ -215,6 +215,10 @@ bool LCodeGen::GeneratePrologue() {
       }
     }
   }
+
+  // Initailize FPU state.
+  __ fninit();
+
   return !is_aborted();
 }
 
@@ -278,9 +282,6 @@ void LCodeGen::DoPrologue(LPrologue* instr) {
     Comment(";;; End allocate local context");
   }
 
-  // Initailize FPU state.
-  __ fninit();
-
   Comment(";;; Prologue end");
 }