Revert "params: core, core/vm, miner: 64bit gas instructions (#3514)"

This reverts commit 8b57c49490.

common/math/integer_test.go

@@ -1,50 +0,0 @@
-package math
-
-import (
-	gmath "math"
-	"testing"
-)
-
-type operation byte
-
-const (
-	sub operation = iota
-	add
-	mul
-)
-
-func TestOverflow(t *testing.T) {
-	for i, test := range []struct {
-		x        uint64
-		y        uint64
-		overflow bool
-		op       operation
-	}{
-		// add operations
-		{gmath.MaxUint64, 1, true, add},
-		{gmath.MaxUint64 - 1, 1, false, add},
-
-		// sub operations
-		{0, 1, true, sub},
-		{0, 0, false, sub},
-
-		// mul operations
-		{10, 10, false, mul},
-		{gmath.MaxUint64, 2, true, mul},
-		{gmath.MaxUint64, 1, false, mul},
-	} {
-		var overflows bool
-		switch test.op {
-		case sub:
-			_, overflows = SafeSub(test.x, test.y)
-		case add:
-			_, overflows = SafeAdd(test.x, test.y)
-		case mul:
-			_, overflows = SafeMul(test.x, test.y)
-		}
-
-		if test.overflow != overflows {
-			t.Errorf("%d failed. Expected test to be %v, got %v", i, test.overflow, overflows)
-		}
-	}
-}