[turbofan] Add backend support for float32 operations.

src/compiler/instruction-codes.h

Index: src/compiler/instruction-codes.h
diff --git a/src/compiler/instruction-codes.h b/src/compiler/instruction-codes.h
index 50e04349ea817f1142022f96c03bb589fad8c1e9..d5c04ab125f8a723ac15eba2c828124d1dd20416 100644
--- a/src/compiler/instruction-codes.h
+++ b/src/compiler/instruction-codes.h
@@ -127,11 +127,11 @@ typedef int32_t InstructionCode;
 // for code generation. We encode the instruction, addressing mode, and flags
 // continuation into a single InstructionCode which is stored as part of
 // the instruction.
-typedef BitField<ArchOpcode, 0, 7> ArchOpcodeField;
-typedef BitField<AddressingMode, 7, 5> AddressingModeField;
-typedef BitField<FlagsMode, 12, 2> FlagsModeField;
-typedef BitField<FlagsCondition, 14, 4> FlagsConditionField;
-typedef BitField<int, 14, 18> MiscField;
+typedef BitField<ArchOpcode, 0, 8> ArchOpcodeField;
+typedef BitField<AddressingMode, 8, 5> AddressingModeField;
+typedef BitField<FlagsMode, 13, 2> FlagsModeField;
+typedef BitField<FlagsCondition, 15, 4> FlagsConditionField;
+typedef BitField<int, 19, 13> MiscField;
 
 }  // namespace compiler
 }  // namespace internal