math: show value of integer constants in comments

Fixes #51282

Change-Id: I5b0d68165b727a427bd4a42663b2fa0070ced22f
Reviewed-on: https://go-review.googlesource.com/c/go/+/343990
Run-TryBot: Robert Griesemer <[email protected]>
Auto-Submit: Robert Griesemer <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Reviewed-by: Robert Griesemer <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: shuLhan

src/math/const.go

@@ -39,19 +39,19 @@ const (
 const (
 	intSize = 32 << (^uint(0) >> 63) // 32 or 64
 
-	MaxInt    = 1<<(intSize-1) - 1
-	MinInt    = -1 << (intSize - 1)
-	MaxInt8   = 1<<7 - 1
-	MinInt8   = -1 << 7
-	MaxInt16  = 1<<15 - 1
-	MinInt16  = -1 << 15
-	MaxInt32  = 1<<31 - 1
-	MinInt32  = -1 << 31
-	MaxInt64  = 1<<63 - 1
-	MinInt64  = -1 << 63
-	MaxUint   = 1<<intSize - 1
-	MaxUint8  = 1<<8 - 1
-	MaxUint16 = 1<<16 - 1
-	MaxUint32 = 1<<32 - 1
-	MaxUint64 = 1<<64 - 1
+	MaxInt    = 1<<(intSize-1) - 1  // MaxInt32 or MaxInt64 depending on intSize.
+	MinInt    = -1 << (intSize - 1) // MinInt32 or MinInt64 depending on intSize.
+	MaxInt8   = 1<<7 - 1            // 127
+	MinInt8   = -1 << 7             // -128
+	MaxInt16  = 1<<15 - 1           // 32767
+	MinInt16  = -1 << 15            // -32768
+	MaxInt32  = 1<<31 - 1           // 2147483647
+	MinInt32  = -1 << 31            // -2147483648
+	MaxInt64  = 1<<63 - 1           // 9223372036854775807
+	MinInt64  = -1 << 63            // -9223372036854775808
+	MaxUint   = 1<<intSize - 1      // MaxUint32 or MaxUint64 depending on intSize.
+	MaxUint8  = 1<<8 - 1            // 255
+	MaxUint16 = 1<<16 - 1           // 65535
+	MaxUint32 = 1<<32 - 1           // 4294967295
+	MaxUint64 = 1<<64 - 1           // 18446744073709551615
 )