Extend assembler and codegen with more fpu arithmetic

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
diff --git a/src/ia32/assembler-ia32.h b/src/ia32/assembler-ia32.h
index 8380897f6f18fa0b8d1bed09ec82b075f1fb4122..000234b7e17620d8221237bfa1743059ca10026b 100644
--- a/src/ia32/assembler-ia32.h
+++ b/src/ia32/assembler-ia32.h
@@ -955,10 +955,13 @@ class Assembler : public AssemblerBase {
   void fninit();
 
   void fadd(int i);
+  void fadd_i(int i);
   void fsub(int i);
+  void fsub_i(int i);
   void fmul(int i);
   void fmul_i(int i);
   void fdiv(int i);
+  void fdiv_i(int i);
 
   void fisub_s(const Operand& adr);