core, eth, trie: bloom filter for trie node dedup during fast sync (#19489)

* core, eth, trie: bloom filter for trie node dedup during fast sync

* eth/downloader, trie: address review comments

* core, ethdb, trie: restart fast-sync bloom construction now and again

* eth/downloader: initialize fast sync bloom on startup

* eth: reenable eth/62 until we properly remove it

vendor/github.com/steakknife/hamming/popcount_slices.go

@@ -0,0 +1,123 @@
+//
+// Package hamming distance calculations in Go
+//
+// https://github.com/steakknife/hamming
+//
+// Copyright © 2014, 2015, 2016, 2018 Barry Allard
+//
+// MIT license
+//
+package hamming
+
+// CountBitsInt8s count 1's in b
+func CountBitsInt8s(b []int8) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsInt8(x)
+	}
+	return c
+}
+
+// CountBitsInt16s count 1's in b
+func CountBitsInt16s(b []int16) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsInt16(x)
+	}
+	return c
+}
+
+// CountBitsInt32s count 1's in b
+func CountBitsInt32s(b []int32) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsInt32(x)
+	}
+	return c
+}
+
+// CountBitsInt64s count 1's in b
+func CountBitsInt64s(b []int64) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsInt64(x)
+	}
+	return c
+}
+
+// CountBitsInts count 1's in b
+func CountBitsInts(b []int) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsInt(x)
+	}
+	return c
+}
+
+// CountBitsUint8s count 1's in b
+func CountBitsUint8s(b []uint8) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsUint8(x)
+	}
+	return c
+}
+
+// CountBitsUint16s count 1's in b
+func CountBitsUint16s(b []uint16) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsUint16(x)
+	}
+	return c
+}
+
+// CountBitsUint32s count 1's in b
+func CountBitsUint32s(b []uint32) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsUint32(x)
+	}
+	return c
+}
+
+// CountBitsUint64s count 1's in b
+func CountBitsUint64s(b []uint64) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsUint64(x)
+	}
+	return c
+}
+
+// CountBitsUints count 1's in b
+func CountBitsUints(b []uint) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsUint(x)
+	}
+	return c
+}
+
+// CountBitsBytes count 1's in b
+func CountBitsBytes(b []byte) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsByte(x)
+	}
+	return c
+}
+
+// CountBitsRunes count 1's in b
+func CountBitsRunes(b []rune) int {
+	c := 0
+	for _, x := range b {
+		c += CountBitsRune(x)
+	}
+	return c
+}
+
+// CountBitsString count 1's in s
+func CountBitsString(s string) int {
+	return CountBitsBytes([]byte(s))
+}