MIPS: Add float instructions and test coverage, part one

src/mips64/constants-mips64.h

Index: src/mips64/constants-mips64.h
diff --git a/src/mips64/constants-mips64.h b/src/mips64/constants-mips64.h
index fcaed5097f808700ac9cf78cabface4fede687f9..defa9a2d7132ffc0c60140bed7641bd9c421ef3a 100644
--- a/src/mips64/constants-mips64.h
+++ b/src/mips64/constants-mips64.h
@@ -499,6 +499,8 @@ enum SecondaryField {
   TRUNC_W_D = ((1 << 3) + 5),
   CEIL_W_D = ((1 << 3) + 6),
   FLOOR_W_D = ((1 << 3) + 7),
+  RECIP = ((2 << 3) + 5),
+  RSQRT_D = ((2 << 3) + 6),
   MIN = ((3 << 3) + 4),
   MINA = ((3 << 3) + 5),
   MAX = ((3 << 3) + 6),
@@ -557,6 +559,9 @@ enum SecondaryField {
   CMP_SOGT = ((3 << 3) + 7),  // Reserved, not implemented.
 
   SEL = ((2 << 3) + 0),
+  MOVF = ((2 << 3) + 1),  // Function field for MOVT.fmt and MOVF.fmt
+  MOVZ_C = ((2 << 3) + 2),
+  MOVN_C = ((2 << 3) + 3),
   SELEQZ_C = ((2 << 3) + 4),  // COP1 on FPR registers.
   SELNEZ_C = ((2 << 3) + 7),  // COP1 on FPR registers.